The human sigh acts as a physiological reset button.
23
By weight, Bone is five times stronger than steel.
417
Tigers can see 6 times better at night than humans.
305
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
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The human brain has the capacity to store everything that you experience.
4k
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62