It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
The structural formulas show the state of ionization that would predominate at pH 7.0
Subtle Differences in Written Words
A strike by 800 women shoemakers in Lynn, Massachusetts, in 1860. In 1851 a Lynn shoemaker had adapt
How to rearrange formulas to isolate for a variable