The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The strangers in your dreams are actually people that you've seen in real life.
50
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Your thumb is about the same size as your nose.
124
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
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31