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Blood is approximately twice as thick as water because of the cells and other components found in it.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

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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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