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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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

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Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

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