Early American humans hunted car-size armadillos and used their shells for houses.
12
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
It has been scientifically proven that stroking a cat can lower one's blood pressure!
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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
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
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
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
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