Iron weighs more after it rusts.
68
Sound travels fifteen times faster through steel than through air.
134
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Hot water can freeze faster than cold water.
181
Research indicates that plants grow healthier when they are stroked.
173
Your brain is 80% water.
525
A cubic yard of air weighs about 2 pounds at sea level.
31