Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The strangers in your dreams are actually people that you've seen in real life.
50
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
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
14
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
There is a persistent storm in Venezuela that produces lightning 140 to 160 nights a year, 10 hours per day and up to 280 times per hour and has been going since at least the 16th century.
25
Your body is creating and killing about 2.4 million red blood cells per second.
17