Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
The colossal squid has the largest eyes in the world.
4
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The human eye blinks an average of 4,200,000 times a year.
233