The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
The major types of plant nutrients and their sources.
Types of Psoriasis
Types of joints.
Personality Types in Harry Potter
Horses Types
An overview of the 5 types of gain, loss, or rearrangement of chromosome