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
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
Babies crawl an average of 200m a day.
212
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Yawns are more contagious among people with closer relationships.
163
Your thumb is about the same size as your nose.
124
Only humans shed emotional tears.
331