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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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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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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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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.

A possible scenario for human evolution A possible scenario for human evolution
An example of a homeostatically controlled variable: blood levels of glucose in a human. An example of a homeostatically controlled variable: blood levels of glucose in a human.
Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye
Although Neandertal brain sizes fall well within the modern human range, their EQ is lower than mode Although Neandertal brain sizes fall well within the modern human range, their EQ is lower than mode
Some species extinction Some species extinction
Life cycle of a Plasmodium species that causes malaria Life cycle of a Plasmodium species that causes malaria
Video: Phases of the Female Reproductive Cycle - Hormonal regulation

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