Were THESE episodes on Nickelodeon?
There are abandoned mental hospitals across the U.S. and horror took place in all of them. Here are six of the scariest of them all. See the whole gallery at Stuff You Should Know.
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!http://www.omgfacts.com/Interesting/The-human-eye-can-spot-a-candle-flame-fr/61385
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.http://ift.tt/PuQH9E