Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
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
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
In one day, adult lungs move about 10,000 litres of air.
11