The strangers in your dreams are actually people that you've seen in real life.
50
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31
A cow produces around 200,000 glasses of milk in her lifetime.
373
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13