The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
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
Your body is creating and killing about 2.4 million red blood cells per second.
17
Only about 2% of the world population has green eyes.
36
You forget 90% of your dreams.
256
The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
94