It takes about 20 seconds for a red blood cell to circle the whole body.
102
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
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
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
It takes approximately 12 hours for food to entirely digest.
93
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The world's shortest man measures only 21.5 inches.
73