Sound travels about 4 times faster in water than in air.
408
The average temperature at 40,000 feet above sea level is -60 F.
56
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
According to studies, men change their minds two to three times more often than women.
72
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Sound at the right vibration can bore holes through a solid object.
134