Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
A hypothetical scenario illustrating the process of chemical selection
Temperature Profile of Earth’s Atmosphere
Temperature and Pressure in the Venusian Atmosphere