Yawns are more contagious among people with closer relationships.
163
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
It takes about 20 seconds for a red blood cell to circle the whole body.
102
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
The human brain doesn't stop developing until about 25 years old.
102
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
In one day, adult lungs move about 10,000 litres of air.
11
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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