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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

The mollusc body plan. The mollusc body plan.
Human Body Muscle Diagram Human Body Muscle Diagram
Abduction and Adduction Abduction–Moving a body part away from the middle. Adduction–Moving a body p Abduction and Adduction Abduction–Moving a body part away from the middle. Adduction–Moving a body p
Overview of body defenses. Overview of body defenses.
Anterior and posterior body regions. Anterior and posterior body regions.
Coelomate body plan of an earthworm Coelomate body plan of an earthworm
Video: Bone Healing Animation

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