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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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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.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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There are more bacteria in your mouth than there are people in the world.

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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.

Surgical instruments prepared for a procedure. Surgical instruments prepared for a procedure.
A Subject Prepared for a Night’s Sleep in a Sleep Laboratory A Subject Prepared for a Night’s Sleep in a Sleep Laboratory
A Patient Being Prepared for Electroconvulsive Therapy. A Patient Being Prepared for Electroconvulsive Therapy.
Biologically Prepared Fear Biologically Prepared Fear
Four common staining procedures used in chromosomal analysis. Most karyotypes are prepared using G-b Four common staining procedures used in chromosomal analysis. Most karyotypes are prepared using G-b
A buffer solution is prepared using 0.5 moles of a weakly basic drug and an unknown quantity of ... A buffer solution is prepared using 0.5 moles of a weakly basic drug and an unknown quantity of ...
Video: Chemical Changes

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