Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
In zero gravity, a candle's flame is round and blue.
16
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Most dust particles in your house are made from dead skin!
67
A cubic yard of air weighs about 2 pounds at sea level.
31