Cows can sleep standing up, but they can only dream lying down.
745
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Only about 2% of the world population has green eyes.
36
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
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3