On average, there's 100 billion neurons in the human brain.
83
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Enamel is hardest substance in the human body.
61
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
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
Only humans shed emotional tears.
331