The strangers in your dreams are actually people that you've seen in real life.
				50
			
			Mars had an oxygen-rich atmosphere around 4 billion years ago
				13
			
			An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
				82
			
			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
			
			A cow produces around 200,000 glasses of milk in her lifetime.
				373
			
			There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
				34
			
			
