Known by tourists as the Eyes of God, the Prohodna cave is a typical karst cave in the north of Bulgaria and lies within one of the largest karst regions of the country. It is 262 meters long and easily accessible due to its two entrances on both sides of the cave. Prohodna cave is naturally lit because of these huge entrances and various holes in the ceiling.
Two of these holes are situated next to each other and their almond-like symmetrical shape gave them the striking resemblance to giant eyes. Seen from a certain angle they resemble a face looking down and during the rain it even seems as if the eyes were crying.

Not only is the cave a popular site for tourists and movie makers, it is also a good location for speleology (the scientific ...

Unlike most bees, which hibernate during colder months, honey bees remain active all winter long despite the freezing temperatures.

A honey bee colony’s ability to survive the winter depends on their food stores of honey. Once the colony begins to run out of honey, the worker bees force the useless drones from the hive, to maintain the food store.

As temperatures drop, the honey bee workers form a cluster around the queen and brood, keeping them warm. Bees on the inside of the cluster can feed on the stored honey. If surrounding temperatures rise, the bees on the outside of the group separate a bit, to allow more air flow. As temperatures fall, the cluster tightens, and the outer bees pull together.

As it gets colder, the worker bees actively ...

Not one to be outdone by the dynamic trio of Alvin, Simon, and Theodore of Alvin and the Chipmunks, the least chipmunk (Eutamias Minimus) is the smallest of all chipmunk species (shown above). Least chipmunks range over most of western North America occupying the widest geographic and altitudinal range of any chipmunk. These tiny rodents possess a long, narrow but fairly bushy tail, and have soft, dense fur which is moulted twice a year - the summer coat being brighter in color than the more greyish winter coat. Like other chipmunks, this species has relatively short ears which are covered in short hairs and pouches inside the cheeks which are used to carry food. Interestingly, the female least chipmunk may be slightly larger than the male ...

Oven a century ago, people were using technology to help them solve math problems. This 100-year-old calculator still works today, and it can calculate into the billions. While the machine may be mathematically accurate, it weighs approximately 70 pounds, significantly more than modern day calculators. That doesn’t sound very convenient. But then again, imagine how strong you would get carrying a 70-pound calculator around school

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Before I begin telling you about this fascinating new glue (adhesive), there's a thing or two you need to know about the animal that inspired it all, the gecko. Geckos are small lizards that have the ability to run up walls and scurry across ceilings with the help of tiny rows of hairs on their feet known as setae. Setae generate a multitude of weak attractions (called Van der Waals forces) between molecules on the two surfaces that add up to a secure foothold. Unlike glue or tape, a gecko’s sticky feet attach and detach effortlessly, which made it a perfect case study for engineers to model.

To create their artificial gecko adhesive, a Stanford team of scientists started by making silicone micro-wedges, which imitated gecko hair. They asse ...

Here's what happens when you pour 1 984°F/1 085°C molten copper on a Big Mac. This demonstration has nothing to do with the fact that McDonald's uses preservatives in its ingredients. This is simply a demonstration of the Leidenfrost effect - a scientific principle explaining the phenomena that occurs when a liquid comes in near contact with a solid that is significantly hotter than its boiling point; the surface of the liquid comes to a nearly immediate boil, and creates a thin layer of protective steam. It's much the same effect as when one drops water onto a hot pan and the droplet is seen to dance across the surface. In this instance, the inherent moisture in the burger protects it for a few moments before the copper (at nearly 2 000 d ...

The little penguin (Eudyptula minor) is the smallest species of penguin. They grow to an average of 33 cm (13 in) in height and 43 cm (17 in) in length and usually weighs about 1.5 kilogram on average (3.3 pounds). They are mainly found on the coastlines of southern Australia and New Zealand. In Australia, they are often called fairy penguins. In New Zealand, they are more commonly known as little blue penguins or blue penguins owing to their slate-blue plumage. ...

In December 2013, four captive chimpanzees in the state of New York became the first nonhuman primates in history to sue their human captors in an attempt to gain their freedom. The chimps' lawyers, members of a recently formed organization known as the Nonhuman Rights Project, were asking a judge to grant their clients the basic right to not be imprisoned illegally. The judges of the New York lawsuits ultimately dismissed them all on the grounds that the plaintiffs aren't people. The appeals are ongoing. ...

The crane fly is the world's most misunderstood insect that looks like a mosquito, but is actually a fly. Although it might look like the daddy longlegs of mosquitos, it is actually harmless and doesn't suck your blood. In fact, some sources suggest that this insect eats other bugs and mosquitoes larvae, acting as natural form of pest control.