Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
One barrel of petroleum holds 42 gallons.
20
Iron weighs more after it rusts.
16
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199