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

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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Peptic ulcer. A peptic ulcer may occur in the stomach (gastric ulcer), as shown here, or in the duod Peptic ulcer. A peptic ulcer may occur in the stomach (gastric ulcer), as shown here, or in the duod
The a helix, a common secondary structure in proteins The a helix, a common secondary structure in proteins
Common Root Words and Combining Forms Cont. Common Root Words and Combining Forms Cont.
Structures of four common types of DNA-binding motifs from eukaryotic transcription factors Structures of four common types of DNA-binding motifs from eukaryotic transcription factors
Common Methods of Contraception Common Methods of Contraception
Early growth of the common bean (Phaseolus vulgaris), a typical eudicot. Early growth of the common bean (Phaseolus vulgaris), a typical eudicot.
Video: Medullary osmotic gradient - influencing factors

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