By weight, Bone is five times stronger than steel.
417
Babies crawl an average of 200m a day.
212
Two in five people in the world marry their first love.
270
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
The Japanese, on average, are the shortest people.
320
Nearly half of the entire world's adult population has never drunk alcohol.
12
40% of people who are rejected in romantic love slip into clinical depression.
72