On average a woman has 4 sexual partners in her lifetime.
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It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
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
The human brain is more active during sleep than during the day.
28
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24