In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
Oasis in space: earthrise over the moon's horizon.
The tenuous atmosphere of Mars, visible on the horizon in this low-orbit photo