In one day, adult lungs move about 10,000 litres of air.
11
Your body is creating and killing 15 million red blood cells per second!
14
A hard working adult sweats up to 4 gallons per day. Most of the sweat evaporates before a person realizes it's there, though!
25
If your stomach didn't produce a new layer of mucous every two weeks, it would digest itself.
33
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Flu shots only work about 70% of the time.
18
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24