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The inside of an igloo isn't cold—they can get up to 60 degrees! Find out how!

Usually when people picture an igloo, they imagine a dome with a little tunnel attached. This is surprisingly accurate! Igloos are surprisingly hospitable, and it all comes down to science.

Snow makes a surprisingly good insulator. When combined with ice to make the walls of the dome sturdy, it creates a cozy little environment. With the occupant’s body heat and perhaps the use of oil lamps or candles, the walls of the igloo melt a little, but then are soon frozen by the temperatures outside. Several days of this melting and refreezing process creates a nice insulation, sometimes of up to 60 degrees Fahrenheit, which is incredibly welcome when the weather outside is -50 degrees Fahrenheit!


The human eye can spot a candle flame from 30 miles away! Learn more about this amazing organ

Think about this next time you complain that you have bad eyesight! The human eye is incredibly sensitive. It’s theoretically possible to see a candle flame from 30 miles away, and the farthest visible light we can see with the naked eye is the Andromeda galaxy, which is 2.6 million light years away!

Of course, there are some limitations. In order to see a candle flame from so far away, it would have to be completely dark and the Earth would have to be flat--or you’d have to look at it from on top of a mountain during a pitch black night!


Dragonflies are the most effective predator in the animal world. How do other predators stack up?

The world can be a rough place for some animals. The capture of prey is necessary for survival, obviously, but not all species are in the same league in terms of effectiveness.

The dragonfly stands above the rest in this category. They have earned the distinction of successfully snatching about 95% of their targeted food. As if that weren’t a difficult enough task, the fact that their prey is usually captured in midair adds another reason to be in awe of the dragonfly’s unmatched effectiveness.

For some fresh perspective, compare the lion, for instance. It struggles to catch a quarter of all the prey it pursues. To take another example, look at the great white shark. For all its fearsomeness, it still manages to catch only about half the prey it goes after.

So what is the key to the dragonfly’s success? Scientists have found that they possess a nervous system that allows them to focus sharply on a single object. The neurons that connect the dragonfly’s brain to its flight motor center create a unique ability to follow a moving target, calculate its future position, skillfully change flight paths, and finally, capture a meal.

Then the process starts over again. Dragonflies go beyond having the capacity to capture prey just once. They have an appetite that can seem nearly impossible to satisfy.


Octopi are so intelligent that they're considered honorary vertebrates in animal cruelty laws!

The octopus isn’t the first animal that comes to mind when most people think of intelligent animals. That may make sense given that octopi are classified are invertebrates and belong to the mollusk family. In fact, there are some mollusks that do not have brains at all, such as the clam.

To say that Octopi are intelligent animals requires some definition of what is meant by “intelligence.” Well, they are capable of having emotions, displaying individual personalities, playing with toys, and can even form relationships with people.

These traits are rare among animals, being that only a few species have those abilities to any great extent. Chimpanzees are one example, but that’s hardly unexpected, since they are closely related to humans. In contrast, Octopi are not at all closely related to human beings.

An octopus has a brain about the size of a walnut, which is the largest brain of any invertebrate. It contains an estimated 130 million neurons. Though many are stored in the arms, they are a good indicator of an animal’s intelligence.

Researchers are aware that we cannot know with complete certainty how various animals perceive the world, but we are discovering new things all the time that we never expected.


You Won't Believe These 15 Facts About "A Nightmare Before Christmas"—Especially How LONG It Took To Film


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