By weight, Bone is five times stronger than steel.
417
There are more than 150 million sheep in Australia, and only some 20 million people.
247
Two in five people in the world marry their first love.
270
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Nearly half of the entire world's adult population has never drunk alcohol.
12
In 2005, 25 percent of Americans over the age of 50 played video games, an increase from nine percent in 1999.
82
Babies crawl an average of 200m a day.
212