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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

Rosalind Franklin and X-ray diffraction applied to DNA wet fibres Rosalind Franklin and X-ray diffraction applied to DNA wet fibres
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Video: What is Reverse Osmosis?

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