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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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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).

Good computer skills are now required to be a successful member of an office staff. Good computer skills are now required to be a successful member of an office staff.
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Video: Types of synapses - electrical & chemical

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