The strangers in your dreams are actually people that you've seen in real life.
50
Only about 2% of the world population has green eyes.
36
Your body is creating and killing about 2.4 million red blood cells per second.
17
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
The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
94
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140