Sound travels about 4 times faster in water than in air.
408
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Iron weighs more after it rusts.
16
Iron weighs more after it rusts.
68
The average temperature at 40,000 feet above sea level is -60 F.
56
Pure water (H2O) does not conduct electricity on its own.
46
Scientists are now able to grow 'beating' heart tissue in a lab!
162