Pumice is the only rock that floats on water.
14
Sound travels about 4 times faster in water than in air.
408
Sound travels fifteen times faster through steel than through air.
134
Iron weighs more after it rusts.
16
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Scientists are now able to grow 'beating' heart tissue in a lab!
162
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116