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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
Vaccines prevent between 2.5 and 4 million deaths every year.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.