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
Only about 2% of the world population has green eyes.
36
The strangers in your dreams are actually people that you've seen in real life.
50
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
14
Your body is creating and killing about 2.4 million red blood cells per second.
17
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16