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There are 60,000 miles of blood vessels in every adult human.
In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
In 1864, the first barbiturate (barbituric acid) was synthesized.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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