You can't tickle yourself.
29
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
Tigers can see 6 times better at night than humans.
305
The average sperm cell swims at 8 inches per hour.
4
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
The human sigh acts as a physiological reset button.
23
All 13 minerals necessary for human life can be found in alcohol beverages.
282