Babies crawl an average of 200m a day.
212
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Enamel is hardest substance in the human body.
61
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18