The bark of an older redwood tree is fireproof.
65
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Iron weighs more after it rusts.
68
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The earth is approx. 6,588,000,000,000,000,000 tons.
175
The sun is 330,330 times larger than the earth.
75
Out of all the senses, smell is most closely linked to memory.
146