Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
Kissing an infection-free partner is good for your teeth!
141
In one day, adult lungs move about 10,000 litres of air.
11
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
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Pain occurs when sounds are above 130 db.
124
There's 100 trillion good bacteria living in your body.
17