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There are more nerve cells in one human brain than there are stars in the Milky Way.
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.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.