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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
The longest a person has survived after a heart transplant is 24 years.
There are more nerve cells in one human brain than there are stars in the Milky Way.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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