Iron weighs more after it rusts.
16
Sound travels about 4 times faster in water than in air.
408
Nylon is made from coal and petroleum.
42
Most dust particles in your house come from dead skin.
48
Cold water weighs more than hot water.
93
The average temperature at 40,000 feet above sea level is -60 F.
56
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
