The human brain doesn't stop developing until about 25 years old.
102
Enamel is hardest substance in the human body.
61
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
The average sperm cell swims at 8 inches per hour.
4
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
If the human eye was a digital camera, it would have 576 megapixels.
25
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69