Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Only about 2% of the world population has green eyes.
36
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
There is a persistent storm in Venezuela that produces lightning 140 to 160 nights a year, 10 hours per day and up to 280 times per hour and has been going since at least the 16th century.
25
Cows can sleep standing up, but they can only dream lying down.
745
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