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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants. Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
The Seringapatam medal shows a lion defeating a tiger The Seringapatam medal shows a lion defeating a tiger
This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero
Pulmonary embolism. The purple shaded section shows the area of the lung that is dying from lack of ... Pulmonary embolism. The purple shaded section shows the area of the lung that is dying from lack of ...
Reactions in assimilation of ammonia and major fates of the fixed nitrogen Reactions in assimilation of ammonia and major fates of the fixed nitrogen
Construct a Lorenz curve that shows income distribution in this society. Construct a Lorenz curve that shows income distribution in this society.
Video: Structures that affect circulation - venous return

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