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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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

Modifications to eukaryotic pre-mRNA are needed to create a functional (mature) mRNA molecule Modifications to eukaryotic pre-mRNA are needed to create a functional (mature) mRNA molecule
Two lionesses and a mature male of a pride, northern Serengeti Two lionesses and a mature male of a pride, northern Serengeti
sperm whale, Physeter macrocephalus sperm whale, Physeter macrocephalus
Sperm by the fallopian tube Sperm by the fallopian tube
The thymus, a primary lymphoid organ where T cells mature. The thymus, a primary lymphoid organ where T cells mature.
(a) Monozygotic (MZ) twins result from the fertilization of a single egg by a single sperm. After on (a) Monozygotic (MZ) twins result from the fertilization of a single egg by a single sperm. After on
Video: Complement Proteins Animation

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