The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
You forget 90% of your dreams.
256
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
14
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82