Thursday, September 19, 2013

OLED

An OLED (organic light-emitting diode) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes. Generally, at least one of these electrodes is transparent. OLEDs are used to create digital displays in devices such as television screens, computer monitors, portable systems such as mobile phones, handheld games consoles and PDAs. A major area of research is the development of white OLED devices for use in solid-state lighting applications.
There are two main families of OLED: those based on small molecules and those employing polymers. Adding mobile ions to an OLED creates a light-emitting electrochemical cell or LEC, which has a slightly different mode of operation. OLED displays can use either passive-matrix (PMOLED) or active-matrix addressing schemes. Active-matrix OLEDs (AMOLED) require a thin-film transistor backplane to switch each individual pixel on or off, but allow for higher resolution and larger display sizes.
An OLED display works without a backlight. Thus, it can display deep black levels and can be thinner and lighter than a liquid crystal display (LCD). In low ambient light conditions such as a dark room an OLED screen can achieve a higher contrast ratio than an LCD, whether the LCD uses cold cathode fluorescent lamps or LED backlight.

What are 1G, 2G, 3G and 4G networks ?

The "G" in wireless networks refers to the "generation" of the underlying wireless network technology. Technically generations are defined as follows:

1G networks (NMT, C-Nets, AMPS, TACS) are considered to be the first analog cellular systems, which started early 1980s. There were radio telephone systems even before that. 1G networks were conceived and designed purely for voice calls with almost no consideration of data services (with the possible exception of built-in modems in some headsets).

2G networks (GSM, CDMAOne, D-AMPS) are the first digital cellular systems launched early 1990s, offering improved sound quality, better security and higher total capacity. GSM supports circuit-switched data (CSD), allowing users to place dial-up data calls digitally, so that the network's switching station receives actual ones and zeroes rather than the screech of an analog modem. 

2.5G networks (GPRS, CDMA2000 1x) are the enhanced versions of 2G networks with theoretical data rates up to about 144kbit/s. GPRS offered the first always-on data service.

3G networks (UMTS FDD and TDD, CDMA2000 1x EVDO, CDMA2000 3x, TD-SCDMA, Arib WCDMA, EDGE, IMT-2000 DECT) are newer cellular networks that have data rates of 384kbit/s and more.
The UN's International Telecommunications Union IMT-2000 standard requires stationary speeds of 2Mbps and mobile speeds of 384kbps for a "true" 3G.

4G technology is mainly a marketing buzzword at the moment. The ITI has taken ownership of 4G, bundling into a specification known as IMT-Advanced. The document calls for 4G technologies to deliver downlink speeds of 1Gbps when stationary and 100Mbps when mobile, roughly 500-fold and 250-fold increase over IMT-2000 respectively. Unfortunately, those specs are so aggressive that no commercialized standard currently meets them.

Historically, WiMAX and Long-Term Evolution (LTE), the standard generally accepted to succeed both CDMA2000 and GSM, have been marketed and labeled as "4G technologies," but that's only partially true: they both make use of a newer, extremely efficient multiplexing scheme (OFDMA, as opposed to the older CDMA or TDMA), however, WiMAX tops at around 40Mbps and LTE at around 100Mbps theoretical speed. Practical, real-world commercial networks using WiMAX and LTE range between 4Mbps and 30Mbps. Even though the speeed of WiMAX and LTE is well short of IMT-Advanced's standard, they're different than 3G networks and carriers around the world refer to them as "4G". Updates to these standards -- WiMAX 2 and LTE-Advanced, respectively -- will increase througput, but neither has been finalized yet.

Touchscreens or Human Machine Interface (HMI)

touchscreen is an electronic visual display that the user can control through simple or multi-touch gestures by touching the screen with one or more fingers. Some touchscreens can also detect objects such as a stylus or ordinary or specially coated gloves. The user can use the touchscreen to react to what is displayed and to control how it is displayed (for example by zooming the text size).
The touchscreen enables the user to interact directly with what is displayed, rather than using a mouse, touchpad, or any other intermediate device (other than a stylus, which is optional for most modern touchscreens).
Touchscreens are common in devices such as game consoles, all-in-one computers, tablet computers, and smartphones. They can also be attached to computers or, as terminals, to networks. They also play a prominent role in the design of digital appliances such as personal digital assistants (PDAs),satellite navigation devices, mobile phones, and video games and some books.
The popularity of smartphones, tablets, and many types of information appliances is driving the demand and acceptance of common touchscreens for portable and functional electronics. Touchscreens are found in the medical field and in heavy industry, as well as for automated teller machines (ATMs), and kiosks such as museum displays or room automation, where keyboard and mouse systems do not allow a suitably intuitive, rapid, or accurate interaction by the user with the display's content.

There are different types of touch screen
Resistive-The resistive touchscreen consists of a flexible top layer made of Polyethylene (PET) and a rigid bottom layer made of glass. Both the layers are coated with a conducting compound called Indium Tin Oxide (ITO) and then spaced with spacers. While the monitor is operational, an electric current flows between the two layers. When a touch is made, the flexible screen presses down and touches the bottom layer. A change in electrical current is hence detected and the coordinates of the point of touch is calculated by the controller and parsed into readable signals for the operating system to react accordingly.   
                                     

Capacitive – he Capacitive Touchscreen Technology is the most popular and durable touchscreen technology used all over the world at most. It consists of a glass panel coated with a capacitive (conductive) material Indium Tin Oxide (ITO). The capacitive systems transmit almost 90% of light from the monitor. Some of the devices using capacitive touchscreen are Motorola Xoom, Samsung Galaxy Tab, Samsung Galaxy SII, Apple’s iPad. There are various capacitive technologies available as explained below.
 
Surface-Capacitive screens, in this technique only one side of the insulator is coated with a conducting layer. While the monitor is operational, a uniform electrostatic field is formed over the conductive layer. Whenever, a human finger touches the screen, conduction of electric charges occurs over the uncoated layer which results in the formation of a dynamic capacitor. The computer or the controller then detects the position of touch by measuring the change in capacitance at the four corners of the screen.
In the Projected-Capacitive Touchscreen Technology, the conductive ITO layer is etched to form a grid of multiple horizontal and vertical electrodes. It involves sensing along both the X and Y axis using clearly etched ITO pattern.


Infra red – works with small infra red LED’s mounted around the outer edges of the glass front and basically divides the surface of the screen into small squares, making it extremely accurate. You can also use a stylus or have gloves on to make this work as it does not require a conductor, your finger, to make it work. In the Infrared Touchscreen Technology, an array of X- and Y- axes are fitted with pairs of IR Leds and photo detectors. The photo detectors detect any change in the pattern of light emitted by the Leds whenever the user touches the monitor/screen.

Surface Acoustic Wave (SAW) – are the most sensitive of the touch screens as it works by sending an ultrasonic wave across the screen, when the screen is touched the ultrasonic beam is altered and the information is sent to the touch controllerThe Surface Acoustic Wave Touchscreen technology contains two transducers (transmitting and receiving) placed along the X-axis and Y-axis of the monitor’s glass plate along with some reflectors. The waves propagate across the glass and are reflected back to the sensors.  When the screen is touched, the waves are absorbed and a touch is detected at that point. These reflectors reflect all electrical signals sent from one transducer to another. This technology provides excellent throughput and image clarity.

The Plural Touch Technology..!!
The plural touch technology or the Multi touch is a variant of the touchscreen technology which can detect two or more touches over its display area at the same time. Some of the common functionalities that require multitouch interface are zooming in, zooming out, rotating objects, panning through a document, virtual keyboard, etc. Multi touch Applications  technology are found in smart phones like iPhone, Samsung Galaxy, Nokia N8, Nexus S, Microsoft Touchtable, Apple’s iPad and many more.

Monday, September 16, 2013

Solanaceae

The Solanaceae, or nightshades, are an economically important family of flowering plants. The family ranges from herbs to trees, and includes a number of important agricultural crops, medicinal plants, spices, weeds, and ornamentals. Many members of the family contain potent alkaloids, and some are highly toxic, but many cultures eat nightshades, in some cases as a staple food. The family belongs to the order Solanales, in the asterid group dicotyledons (Magnoliopsida). The solanaceae family consists of approximately 98 genera and some 2,700 species, with a great diversity of habits, morphology and ecology.
The name Solanaceae derives from the genus Solanum "the nightshade plant". The etymology of the Latin word is unclear. The name may come from a perceived resemblance of certain solanaceous flowers to the sun and its rays. In fact one species of Solanum (Solanum nigrum) is known as the "sunberry". Alternatively, the name could originate from the Latin verb solari, meaning "to soothe", presumably referring to the soothing pharmacologicalproperties of some of the psychoactive species of the family.
The family has a worldwide distribution being present on all continents except Antarctica. The greatest diversity in species is found in South Americaand Central America.
Solanaceae includes a number of commonly collected or cultivated species. Perhaps the most economically important genus of the family is Solanum, which contains the potato (Solanum tuberosum, in fact, another common name of the family is the "potato family"), the tomato (Solanum lycopersicum), and the aubergine or eggplant (Solanum melongena). Another important genus Capsicum produce both chilli peppers and bell peppers.
The genus Physalis produces the so-called groundcherries, as well as the tomatillo (Physalis philadelphica), the Cape gooseberry and the Chinese lantern. The genus Lycium contains the boxthorns and the wolfberry Lycium barbarumNicotiana contains, among other species, the plant that produces tobacco. Some other important members of Solanaceae include a number of ornamental plants such as PetuniaBrowallia and Lycianthes, the source of psychoactive alkaloids, DaturaMandragora (mandrake), and Atropa belladonna (deadly nightshade). Certain species are universally known for their medicinal uses, their psychotropic effects or for being poisonous.

Aconitum

Aconitum  also known as "the queen of poisons"aconitemonkshoodwolf's baneleopard's banewomen's banedevil's helmet or blue rocket, is a genus of over 250 species of flowering plants belonging to the family Ranunculaceae. These herbaceousperennial plants are chiefly native to the mountainous parts of the northern hemisphere, growing in the moisture-retentive but well-draining soils of mountain m
eadows. Most species are extremely poisonous and must be dealt with carefully.
The name comes from the Greek á¼€ÎºÏŒÎ½Î¹Ï„ον, meaning "without struggle". Toxins extracted from the plant were used to kill wolves in older times, hence the name wolf's bane.

Description

The dark green leaves of Aconitum species lack stipules. They are palmate or deeply palmately lobed with 5–7 segments. Each segment again is 3-lobed with coarse sharp teeth. The leaves have a spiral (alternate) arrangement. The lower leaves have long petioles.

Dissected flower of Aconitum vulparia, showing the nectaries
The tall , erect stem is crowned by racemes of large blue, purple, white, yellow or pink zygomorphic flowers with numerous stamens. They are distinguishable by having one of the five petaloid sepals (the posterior one), called the galea, in the form of a cylindrical helmet; hence the English name monkshood. There are 2–10 petals, in the form of nectaries. The two upper petals are large. They are placed under the hood of the calyx and are supported on long stalks. They have a hollow spur at their apex, containing the nectar. The other petals are small and scale-like or non-forming. The 3–5carpels are partially fused at the base.
The fruit is an aggregate of follicles, a follicle being a dry many-seeded structure.

Thursday, September 12, 2013

Arc Reactor

History

The Repulsor Tech node, as called in Earth-616, is a type of fusion power which derived from the Repulsor Technology of the Iron Man suit created by Tony Stark. It can be used as a source for clean energy as well as a powerful bomb, further modifications made along Rand Industries discarding the second possible application.
The arc reactor also generates an electromagnetic field.
During an attack made by suicide bombers created by Ezekiel Stane, Pepper Potts was gravely injured in a similar way Tony was in Afghanistan. Tony implemented this new technology into her, allowing her not only to survive the shrapnel near her heart, enabling surgery, but to heal quickly and control the reactor at will to create specific magnetic fields for protection or to levitate, and beams of energy.

After the Skrull Invasion,Norman Osborn became the director of S.H.I.E.L.D.'s successor H.A.M.M.E.R., dismissing Stark, and got access to the Superhuman Registration Act's database containing the secret identities of almost every hero. Tony managed to erase the one property of S.H.I.E.L.D. before Osborn managed to open it, and in order to do the same with the backup in the Extremis in his body, he had to reset it, thus his entire body.
In the end, Tony Stark fell into a coma-like state. Pepper's arc reactor was used to run Stark's body once more by using it to run the basic machine codes to keep Stark's Extremis-modified body working.
After returning to life, Tony used the arc reactor to power his new Bleeding Edge armor as well as similar devices were used to create new technologies for his new organization Stark Resilient such as a Repulsor Car, and empower the newly reconstructed Asgardia.
Since he first used it, Tony used this armor to empower any newly-created armors. Another new arc reactor was implanted to Virginia Potts.

Alternate Realities

Marvel Cinematic Universe (Earth-199999)

In this universe, the Arc Reactor was a device initially designed by Howard Stark, and later adapted by his son,Tony. A massive arc reactor provided power for the sprawling complex of Stark Industries until its destruction, and now the Stark Tower. This design was miniaturized by Tony to power a life-saving electromagnet in his chest.
Arc Reactor (Earth-199999) miniaturized third version
Third miniaturized version of the reactor

Further upgrades to the design allowed Stark to employ successive generations of arc reactors, most notably in powering his crowning achievement, the Iron Man armor. Early generations of Iron Man armor were powered by much the same arc reactor technology as had powered Stark's electromagnet device, however poisoning from the palladium within the reactors were having an adverse effect on his health. This forced a radical redesign whereby Tony created a new element previously only theorized by his father years earlier. This new arc reactor had a massive power output advantage over previous arc reactors and was the first to power the formidable Iron Man MK VI armor.
Since their inception, mini arc reactors have powered successive generations of the Iron Man armor as a force for good. They have also fallen into the hands of far less savory individuals and used to power further battle suits for criminal operations, and a fleet of robotic battle drones

Lycaon

in Greek mythologyLycaon was a king of Arcadia, son of Pelasgus and Meliboea, who in the most popular version of the myth tested Zeusby serving him a dish of his slaughtered and dismembered son in order to see whether Zeus was truly omniscient. In return for these gruesome deeds Zeus transformed Lycaon into the form of a wolf, and killed Lycaon's fifty sons by lightning bolts, except possibly Nyctimus, who was the slaughtered child, and instead became restored to life.

Saturday, August 24, 2013

Spectrometer

spectrometer (spectrophotometerspectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's intensity but could also, for instance, be the polarization state. The independent variable is usually the wavelengthof the light or a unit directly proportional to the photon energy, such as wavenumber or electron volts, which has a reciprocal relationship to wavelength. A spectrometer is used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities. Spectrometer is a term that is applied to instruments that operate over a very wide range of wavelengths, from gamma rays and X-raysinto the far infrared. If the instrument is designed to measure the spectrum in absolute units rather than relative units, then it is typically called a spectrophotometer. The majority of spectrophotometers are used in spectral regions near the visible spectrum.
In general, any particular instrument will operate over a small portion of this total range because of the different techniques used to measure different portions of the spectrum. Below optical frequencies (that is, at microwave and radio frequencies), the spectrum analyzer is a closely related electronic device.

Saturday, August 17, 2013

Quantum tunnelling

Quantum tunnelling or tunneling  refers to the quantum mechanical phenomenon where a particle tunnels through a barrier that it classically could not surmount. This plays an essential role in several physical phenomena, such as the nuclear fusion that occurs in main sequence stars like the Sun. It has important applications to modern devices such as the tunnel diode and the scanning tunnelling microscope. The effect was predicted in the early 20th century and its acceptance, as a general physical phenomenon, came mid-century.
Tunnelling is often explained using the Heisenberg uncertainty principle and the wave–particle duality of matter. Purely quantum mechanical concepts are central to the phenomenon, so quantum tunnelling is one of the novel implications of quantum mechanics.

Introduction to the concept


Quantum tunnelling falls under the domain of quantum mechanics: the study of what happens at the quantum scale. This process cannot be directly perceived, but much of its understanding is shaped by the macroscopic world, which classical mechanics can not adequately explain. To understand the phenomenon, particles attempting to travel between potential barriers can be compared to a ball trying to roll over a hill; quantum mechanics and classical mechanics differ in their treatment of this scenario. Classical mechanics predicts that particles that do not have enough energy to classically surmount a barrier will not be able to reach the other side. Thus, a ball without sufficient energy to surmount the hill would roll back down. Or, lacking the energy to penetrate a wall, it would bounce back (reflection) or in the extreme case, bury itself inside the wall (absorption). In quantum mechanics, these particles can, with a very small probability, tunnel to the other side, thus crossing the barrier. Here, the ball could, in a sense, borrow energy from its surroundings to tunnel through the wall or roll over the hill, paying it back by making the reflected electrons more energetic than they otherwise would have been.


Iridium

Iridium is the chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is the second-densest element (after osmium) and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.
Iridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named the iridium for the Greek goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. Iridium is one of the rarest elements in theEarth's crust, with annual production and consumption of only three tonnes. 191Ir and 193Ir are the only two naturally occurring isotopes of iridium as well as the only stable isotopes; the latter is the more abundant of the two.

Wednesday, August 7, 2013

The Top 10 Most Mysterious Creatures of Modern Times

THERE ARE CREATURES that lurk out there in the dark, that haunt the isolated forests of the world, that hide in the icy depths of the deepest lakes. They appear unexpectedly and inexplicably, then vanish just as mysteriously, usually leaving witnesses dumbfounded, frightened and, unfortunately in most cases, without a shred of evidence. Yet the eyewitness stories of these creatures persist, haunting the darkness as well as our imaginations. Here, for your consideration (and in no particular order) are the top 10 most mysterious, unexplained creatures of all time. Some are more likely to really exist than others, but we'll leave that judgment up to you.
1. Bigfoot / Sasquatch / Yeti
These hairy apemen are probably the most consistently witnessed unknown creatures in the world. Whether they are called Bigfoot, Sasquatch, Yeti, Skunk Ape or Yowie, they have been seen in isolated woodlands and mountain areas in virtually every corner of the globe. And the descriptions - from the North American northwest to Florida to Australia - are remarkably consistent:
  • taller than an average man (seven to eight feet)
  • covered with long brown or auburn hair (or white hair in the case of the Yeti)
  • a strong, repugnant odor
  • large feet, as evidenced by castings of footprints
  • an aversion to man
  • a piercing, eerie howl
The vast number of sightings, many by highly reliable witnesses, gives Bigfoot, in my estimation, the best likelihood of being a real creature as yet unknown to science. But what is it? A missing link? Some ancient relative of humans that somehow has survived in the wilderness? An unknown species of ape?
We may find out someday soon. Sightings seem to be on the increase as mankind encroaches deeper and deeper on the wilderness. And technology may aid in the search. The Bigfoot Field Researchers Organization recently announced its intention to place motion-triggered digital webcams in various areas of US forest where the hairy beast has been seen. This 24-hour surveillance with potentially thousands of computer-based witnesses looking on will dramatically increase the chances of obtaining credible evidence.
For the diehard skeptic, nothing less than a captured specimen will do - or at least some other tangible evidence. And one that could qualify has recently emerged: an impression of Bigfoot's butt. No kidding. Researchers in the American northwest have found what appears to be the impression in the ground of where a large hairy primate has sat. Hey, he's got to rest those big feet sometime.
2. Loch Ness Monster (and other Lake monsters)
Despite excellent expeditions with sophisticated electronic equipment, the lake monsters of the world continue to elude scientists. Yet spontaneous sightings by good witnesses, although rare, persist.
The Loch Ness monster, or Nessie, is undoubtedly the most well-known of these aquatic mysteries. But other deep, cold lakes around the world have their own legendary beasts: Chessie in Chesapeake Bay, Storsie in Sweden's Lake Storsjön, Selma in Norway's Lake Seljordsvatnet and "Champ" in New York's Lake Champlain among others.
Descriptions of this creature, too, are amazingly similar:
  • a large creature with a long neck
  • a horse-like head
  • a humped back
Most sightings report the humps protruding from the surface of the water (which skeptics dismiss as being almost anything, from schools of fish to floating logs), but occasionally a lucky witness will see the creature stretch its neck high above the water and look around a bit before submerging.
Photo and video evidence is rare. And although some of the photos are tantalizing (most notably the famous "flipper" photo taken by the Rines expedition in 1975), most such "proof" is fuzzy or inconclusive at best.
If the creature does exist, many researchers suspect that it could be a kind of plesiosaur - an animal from the age of the dinosaurs that is thought to have become extinct more than 66 million years ago. Could a lineage of these incredible creatures possibly have survived?
3. Chupacabra
Even though some sightings date back to the 1970s, El Chupacabra - "the goat sucker" - is primarily a phenomenon of the 1990s, and its fame has largely been spread by the Internet. The sightings started in earnest in 1995 with reports coming out of Puerto Rico of a strange creature that was killing farmers' livestock - chickens, ducks, turkeys, rabbits and, of course, goats - sometimes hundreds of animals in one evening. The farmers, who were familiar with the killing practices of wild dogs and other predators, claimed that the methods of this unknown beast were different. It didn't try to eat the animals it killed, for example; nor did it drag them away to be devoured elsewhere. Instead, the creature killed by draining its victims of blood, usually through small incisions.
Then came the bizarre eyewitness descriptions:
  • about the size of a chimpanzee
  • hops about like a kangaroo
  • large glowing red eyes
  • grayish skin and hairy arms
  • long snake-like tongue
  • sharp fangs
  • quills running along its spine that seem to open and close like a fan
  • some believe it may even have wings
Toward the end of the '90s, the sightings of Chupacabra began to spread. The creature was blamed for animal killings in Mexico, southern Texas and several South American countries. In May and June of 2000, a rash of incidents took place in Chile, according to certain newspapers there. In fact, some of the most incredible claims yet came out of those sightings: that at least one of the creatures was caught alive by local authorities, then handed over to official agencies of the US government.
What is it? Theories abound, including: an unknown but natural species of predator; misidentified known predators; the result of genetic experimentation; an alien. Most serious researchers consider Chupacabra merely folklore, perpetuated by over-enthusiastic locals immersed in superstition or a penchant for telling tall, exaggerated tales.
4. The Jersey Devil
There is a terrifying creature, they say, that haunts the dense pine barrens of New Jersey, and its frightening appearance earned it the name of The Jersey Devil. The legend of the Jersey Devil dates back to about the mid-1700s when it was considered an omen of disaster or war, but multiple sightings did not begin until the early 1900s. Some researchers claim that more than 2,000 witnesses have reported seeing the creature over the centuries. Although rare, sightings continue up to the present day.
Descriptions vary, but these are the most commonly cited attributes:
  • about three-and-a-half feet high
  • a head like a collie dog and a face like a horse
  • a long neck
  • wings about two feet long
  • back legs like those of a crane
  • horse's hooves
  • walks on its back legs and holds up two short front legs with paws on them
It's interesting to note the similarities to Chupacabra!
Unexplained animal deaths and mutilations have been blamed on The Jersey Devil. Dozens of eyewitnesses claim to have been frightened out of their wits by it. What could this creature possibly be? The theories are similar to those cited for Chupacabra, but something scary definitely seems to be out there in the New Jersey woods.
5. Mothman
For about 13 months beginning in November, 1966, a series of bizarre sightings took place around the area of Point Pleasant, West Virginia. Aside from a spate of UFO reports and claimed poltergeist activity, several witnesses came forward with descriptions of an astonishing creature that may have been the focal point of all the weird goings-on. As detailed in John Keel's classic book, The Mothman Prophecies, hundreds of witnesses allegedly saw a large, winged humanoid being.
Here is how they described it:
  • approximately seven feet tall
  • a wingspan over 10 feet wide
  • gray, scaly skin
  • large, red, glowing and hypnotic eyes
  • able to take off straight up in flight, traveling up to 100 miles an hour
  • liked to mutilate or eat large dogs
  • screeched or squealed like a rodent or electric motor
  • caused radio and television interference
  • had some mind control powers.
Dubbed Mothman by a local newspaperman, the creature seemed to have a peculiar affect on those with whom it came into contact: they began to "channel" information from what Keel called "ultra-terrestrial" entities. Keel himself was affected in this way, receiving "prophecies" from some unknown origin that were, more often than not, oddly less than accurate.
6. Elves and Fairies
There aren't many people who take seriously the existence of elves and fairies in today's society. Yet there are people who will swear on the heads of their grandchildren that they have seen them with their own eyes - just as plainly as others have seen ghosts, Bigfoot or the Loch Ness monster.
The stories of elusive little people are as ancient as civilization itself and can be found in virtually every culture on Earth. Most familiar to us are the legends of elves, dwarfs, leprechauns and trolls from Europe and Scandinavia. They have been the subject of dozens of children's fairy tales, books, myths and inebriated tales. William Shakespeare made them central characters in A Midsummer Night's Dream.
  • Generally, fairies were described as tiny ephemeral beings with wings who resided in forests.
  • Elves, dwarfs and leprechauns were likewise residents of the forest. Unlike fairies, however, they were quite human in appearance - except for their diminutive size. They were often pictured as having their own miniature civilization, hidden away from the human world.
On a summer night in 1919, 13-year-old Harry Anderson claimed to have seen a column of 20 little men marching in single file, made visible by the bright moonlight. He noted they were dressed in leather knee pants with suspenders. The men were shirtless, bald and had pale white skin. They ignored young Harry as they passed, mumbling something unintelligible all the while.
In Stowmarket, England in 1842, a man claimed this encounter with "faries" when walking through a meadow on his journey home: "There might be a dozen of them, the biggest about three feet high, and small ones like dolls. They were moving around hand in hand in a ring; no noise came from them. They seemed light and shadowy, not like solid bodies. I... could see them as plain as I do you. I ran home and called three women to come back with me and see them. But when we got to the place, they were all gone. I was quite sober at the time."
7. The Dover Demon
Dover, Massachusetts was the location of the sighting of a bizarre creature for a few days beginning on April 21, 1977. Although the creature, which became known as "the Dover Demon," was only seen by a few people in this short period of time, it is considered one of the most mysterious creatures of modern times.
The first sighting was made by 17-year-old Bill Bartlett as he and three friends were driving north near the small New England town at around 10:30 at night. Through the darkness, Bartlett claimed to have seen an unusual creature creeping along a low stone wall on the side of the road - something he had never seen before and could not identify. The other boys did not see it, but it was obvious to them that Bartlett was shaken by the experience. When he arrived home, he told his father about his experience and sketched a drawing of the creature.
Just a few hours after Bartlett's sighting, at 12:30 a.m., John Baxter swore that he saw the same creature while walking home from his girlfriend's house. The 15-year-old boy saw it with its arms wrapped around the trunk of a tree, and his description of the thing matched Bartlett's exactly.
The final sighting was reported the next day by another 15-year-old, Abby Brabham, a friend of one of Bill Bartlett's friends, who said it appeared briefly in the car's headlights while she and her friend were driving. Again, the description was consistent. This is the creature they allegedly saw:
  • about four feet tall on two legs
  • hairless body with rough-textured skin
  • long, spindly peach-colored limbs
  • a large watermelon-shaped head, nearly as big as its body large glowing orange eyes.
Subsequent investigations into this unusual case turned up no hard evidence for the reality of the creature, but neither was there evidence of a hoax nor a motive for perpetrating one. Skeptics suggested that what the teenagers saw was a young moose, while UFOlogists who looked into the case wondered if there was an extraterrestrial connection.
8. The Loveland Lizard
This remarkable creature has earned its place in the annals of the unknown primarily because of the credibility of the involved witnesses: two police officers on two separate occasions.
The scene is the early hours of March 3, 1972. A police officer is cruising on Riverside Ave., which runs for a few blocks along the Little Miami River in Loveland, Ohio. On the side of the road he sees what he at first thinks is a dog lying there. He slows his vehicle on the icy road to avoid hitting the animal should it get up and run in front of him. He nears the animal and stops his patrol car, at which point the creature quickly stands on two legs to a crouching position. Illuminating the creature with his headlights, the officer can now clearly see that it is not a dog at all, but something he cannot explain:
  • three to four feet tall
  • 50 to 75 pounds
  • leathery skin
  • possibly wet, matted hair on its body that made it look textured possibly a short tail
  • a head and face like a frog or lizard
Whatever this creature was, it looked at the officer briefly, then leapt over the road's guard rail toward the river.
The officer reported the odd sighting to the police dispatcher, then later returned to the scene of the incident with another officer. All they found was evidence that something had scraped the hillside as it made its way down to the river.
The creature may have been completely forgotten had not a second police officer seen it again two weeks later. The second officer also at first thought the thing lying in the middle of the road was a dog or roadkill. When he got out of his car to haul it to the side of the road, it got up, climbed over the guard rail this time, all the while keeping its eyes on the officer, and disappeared toward the river. His description of the creature pointed out the same frog-like characteristics. A subsequent investigation uncovered only one other possible sighting around the same time; a farmer claimed to have seen some kind of large, lizard-like creature. It thereafter became known as the Loveland Lizard or Loveland Frog.
9. Living Dinosaurs
We were all awestruck by the incredibly realistic digital effects of the Jurassic Park movies, and tantalized by the possibility that cloning of long-extinct dinosaurs might one day be possible.
But what if dinosaurs are still alive? What if some dinosaurs have somehow survived extinction to coexist with us today? Some people believe they actually might have. Living dinosaurs!
For over 200 years, rare but fascinating reports have filtered out of the dense isolated rain forests of Africa and South America that native tribes - some of which live very much as they have for thousands of years - were familiar with large creatures that can only be described as resembling sauropods, like the apatosaurus.
The tribes had names for them, such as jago-nini ("giant diver"),dingonekol-umaina, and chipekwe. In 1913, Captain Freiheer von Stein zu Lausnitz, a German explorer, was told by Pygmies of a fearsome creature they called mok'ele-mbembe ("stopper of rivers"). This is the description of mok'ele-mbembe provided by the natives:
  • smooth brownish gray skin
  • approximately the size of an elephant; at least that of a hippopotamus; possibly about 30 feet long
  • a long, flexible neck
  • a vegetarian diet, but would kill humans if they came too close
During an expedition to search for mok'ele-mbembe in 1980, cryptozoologist Roy Mackel and herpetologist James Powell allegedly showed pictures of local animals to the natives, all of which they correctly identified. When they showed them an illustration of a large sauropod, they identified it as mok'ele-mbembe.
Aside from the testimony of these tribespeople (which some skeptics have written off as making fools of the white man), the evidence for living dinosaurs is scant. Supposedly, a few explorers have found extraordinarily large footprints (as large as a Frisbee), and in 1992, a Japanese expedition is said to have about 15 seconds of film footage taken from an airplane that shows some large shape moving in water, leaving a V-shaped wake. Unfortunately, it could not be identified.
Recent expeditions in search of mok'ele-mbembe have taken place. They explored the Likoula region of the Congo for four weeks with the official mission objective of a "scientific investigation and analysis of reports of a living dinosaur." Unfortunately, again, they returned empty-handed. New expeditions will undoubtedly continue to search for living dinosaurs. The prospect of actually documenting a find is just too tempting.
10. Spring-Heeled Jack
He appeared out of the shadows of 19th century London nights, attacked his victims with dreadful scratches, then bounded away with superhuman ability before he could be apprehended.
The case of Spring-Heeled Jack, as this creature came to be known, is one of the most baffling to come out of Victorian England, and one that has never been solved or fully explained. According to most accounts of the story, the attacks began in 1837 in southwest London. Polly Adams, a pub worker, was one of three women accosted by Spring-Heeled Jack in September of that year. He allegedly tore her blouse off and scratched at her stomach with iron-like fingernails or claws.
His victims painted a bizarre portrait of the ghoul:
  • man-like, but with a hideous face
  • sharp iron-like fingernails or claws
  • tall, thin and powerful
  • glowing eyes
  • the ability to spit blue flames from his mouth
  • wore a dark cloak over a tight-fitting white oilskin suit
  • some claimed he wore a helmet of some kind
  • the ability to jump incredible heights and distances
The attacks continued into early 1838, prompting official action by the Lord Mayor of London who declared him a public nuisance, and resulting in at least one vigilante group that systematically tried to capture the creature, all without success.
Rumors of sightings persisted into the 1850s, '60s and '70s. In these cases, he is said to have frightened people with his appearance, slapped army sentries, and in each case leapt away to the astonishment and frustration of those who tied to catch him. Interestingly, Spring-Heeled Jack never killed or seriously hurt anyone, except 18-year-old Lucy Scales who was reportedly blinded temporarily by the searing blue flames Jack vomited into her face.
Who or what was Spring-Heeled Jack? A clever if diabolical maniac? An alien? A demon? Chances are we will never know, and he will remain one of the most mysterious creatures of modern times.