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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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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.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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