Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Tigers can see 6 times better at night than humans.
305
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Gorillas can catch human colds and other illnesses.
205
Babies crawl an average of 200m a day.
212