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Vaccines prevent between 2.5 and 4 million deaths every year.
Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Thyroid conditions may make getting pregnant impossible.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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