The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
You forget 90% of your dreams.
256
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
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
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31