Iron weighs more after it rusts.
68
According to studies, men change their minds two to three times more often than women.
72
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Most liquid laundry detergents are alive with living organisms that help to break down stains!
88
One barrel of petroleum holds 42 gallons.
20
Sound travels about 4 times faster in water than in air.
408
A cubic yard of air weighs about 2 pounds at sea level.
31