If left alone, 70% of birthmarks gradually fade away.
193
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
In Georgia, there is an airtight room called the Crypt of Civilization that was sealed in 1940. It contains numerous artefacts documenting what life was like at the time of sealing, and is scheduled to be opened in the year 8113 to show people of the future exactly what life was like.
13
You can actually sharpen the blades on a pencil sharpener by wrapping your pencils in aluminum foil before inserting them.
209
160 cars can drive side by side on the Monumental Axis in Brazil, the world's widest road.
39
Like fingerprints, everyone's tongue print is different.
250
A pipe 2 feet in diameter will allow four times more fluid to pass through it than a pipe 1 foot in diameter.
20
The symbol on the 'pound' key (#) is called an octothorpe.
82