Coins usually survive in circulation for about 30 years.
66
The exact cause of death and burial site of Genghis Khan is unknown, because all of the 2000 funeral guests and 800 soldiers were killed in order to preserve the secret.
16
Sitting straight upright in your chair is bad for your back. You should instead slouch at an angle of 135 degrees.
10
Jupiter is bigger than all the other planets combined.
254
Scientists are excavating the ruins of a major civilization which pre-dates both the pyramids and Stonehenge by over 7,000 years. In 15 years, they have uncovered only about 5% of the site.
21
The Pirate Bay tried buying their own island in hopes of making their own country with no copyright laws.
3
The lifespan of mammals is about 1 and a half billion heartbeats.
127