A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The strangers in your dreams are actually people that you've seen in real life.
50
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Iceland has been so culturally isolated through history since the Vikings, that compared to other Scandinavian counties, people who speak Icelandic can still read the old Norsk sagas.
4
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31