One barrel of petroleum holds 42 gallons.
20
Iron weighs more after it rusts.
68
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Sound travels about 4 times faster in water than in air.
408
Cold water weighs more than hot water.
93
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71