On average, there's 100 billion neurons in the human brain.
83
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
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
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Your fingernails grow faster in summer.
744
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23