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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
There are more bacteria in your mouth than there are people in the world.
Did you know?
Thyroid conditions may make getting pregnant impossible.
Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.