The bark of an older redwood tree is fireproof.
65
Iron weighs more after it rusts.
68
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
One third of the electricity produced on earth is used to power electric light bulbs!
75
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Your brain is 80% water.
525