The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Only humans shed emotional tears.
331
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
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
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
