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 focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
94
If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31
Your body is creating and killing about 2.4 million red blood cells per second.
17
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
Your thumb is about the same size as your nose.
124
The strangers in your dreams are actually people that you've seen in real life.
50