There's 100 trillion good bacteria living in your body.
17
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human body contains over a billion miles of DNA.
147
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
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19