There are more bacteria in your mouth than there are people in the world.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The horizontal fraction bar was introduced by the Arabs.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
Conifer leaves
Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater,
Rotating around any node leaves a phylogeny unchanged
V-shaped Valley of the Yellowstone River
People who are color-blind see colors differently. (a) Those with normal vision see the red leaves.
Elephant (Loxodonta africana) herd drinking at water hole. Etosha National Park, Namibia.