Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
A cubic yard of air weighs about 2 pounds at sea level.
31
The sun is 330,330 times larger than the earth.
75
The bark of an older redwood tree is fireproof.
65
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Hot water can freeze faster than cold water.
181
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15