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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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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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

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Everyone has one nostril that is larger than the other.

Auxin transport. Auxin transport.
How noncyclic electron flow during the light reactions generates ATP and NADPH. How noncyclic electron flow during the light reactions generates ATP and NADPH.
Cyclic electron flow. Cyclic electron flow.
(A) Major leukocytes. (B) Enhanced color photograph from a scanning electron microscope of a ... (A) Major leukocytes. (B) Enhanced color photograph from a scanning electron microscope of a ...
Water vapor is supplied to the atmosphere by local evaporation or horizontal transport (advection). Water vapor is supplied to the atmosphere by local evaporation or horizontal transport (advection).
Opener Transmission electron micrograph of human DNA Opener Transmission electron micrograph of human DNA
Video: Brain Anatomy Animation (Part 2 of 2)

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