Rail travel in the United States was established around

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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Sources of Energy in the United States

The percentage of women over 40 in the United States who are childless has almost doubled in the ...

For millions of people, the United States represents a land of opportunity and freedom from ...

A fuel pump in a farming area that clearly states the red diesel fuel is for off-road use only ...

Connect a fuelpressure gauge to the fuel rail at the Schrader valve.

Many countries do not produce enough food and need to import food from the United States

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