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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
The longest a person has survived after a heart transplant is 24 years.
As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.