More than 50% of the people in the world have never made or received a telephone call. See more

Wearing headphones for just one hour will multiply the number of bacteria in your ear 700 times. See more

A 'jiffy' is an actual unit of time for 1/100th of a second. See more

If you are locked in a completely sealed room, you will die of carbon dioxide poisoning before you will die of oxygen deprivation. See more

Due to gravitational effects, you weigh slightly less when the moon is directly overhead. See more

The screwdriver was invented before the screw. See more

111,111,111 x 111,111,111 = 12,345,678,987,654,321. See more

Intelligent people have more zinc and copper in their hair. See more

Men can read smaller print than women; women can hear better. See more