Pumice is the only rock that floats on water.
14
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The sun is 330,330 times larger than the earth.
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75