Some 'facts' posted here that aren't true...
If you drop a penny off of the Empire State Building, it will be going 106 miles per hour (terminal velocity) when it reaches the ground. Something moving this fast may actually cause head injuries if it lands on you
Mythbusters tested this...a penny's terminal velocity is 65mph (105kph) and its mass is too low to do any damage either to asphalt or a crash dummy. Even fired out of a rifle it didn't break the asphalt. Also, at the Empire State Building, there are updrafts that would prevent the penny from falling very far at all, and the tiers below the top would catch it anyway.
No piece of paper can be folded in half consecutively more than 7 times
In 2001, a fifteen-year-old American schoolgirl proved that the number of folds of a piece of paper is dependent upon its width, length and thickness. If you fold it in one direction only, the formula is:
L = πt/6 (2n + 4)(2n -1)
L is length, t is thickness, n is number of folds. If you're folding in alternate directions, then the formula is...
W = πt2(3/2)(n-1)
W is width, t is thickness, n is number of folds.
To prove this, she folded a 1200 metre piece of toilet paper twelve times in one direction. She also folded a very thin piece of gold foil in alternate directions twelve times.
A goldfish has a memory span of three seconds.
Research has shown that goldfish have memories that can last at least three months. They have been trained to know that feed comes at a particular time of day, how to complete obstacle courses, and to recognise shapes and colours.
"I am." is the shortest complete sentence in the English language.
What about 'No'?. "Are you ready yet?". "No".
Polar bears are left-handed.
There's no evidence to support this fact at all. It could be true, but it's very doubtful.
Duck's quacks don't echo.
Again, Mythbusters tested this and found that it's very hard to hear the echo because of their very similar waveforms. Human ears cannot hear a quack's echo because it is 'swallowed' by the quack. But it is there.