Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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It takes about 20 seconds for a red blood cell to circle the whole body.
102
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
In one day, adult lungs move about 10,000 litres of air.
11
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
There are about 255 babies born worldwide every minute.
46