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
Tigers can see 6 times better at night than humans.
305
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
It takes approximately 12 hours for food to entirely digest.
93
On average a woman has 4 sexual partners in her lifetime.
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The human brain has the capacity to store everything that you experience.
4k
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139