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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Did you know?
Cyanide works by making the human body unable to use oxygen.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.

