The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Your thumb is about the same size as your nose.
124
Only about 2% of the world population has green eyes.
36
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The largest breed of rabbit is the Flemish Giant.
65