Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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 average sperm cell swims at 8 inches per hour.
4
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
A human being loses an average of 40 to 100 strands of hair a day.
133
By weight, Bone is five times stronger than steel.
417
Gorillas can catch human colds and other illnesses.
205
