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Did you know?

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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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

Schematic depiction of the hydrophobic effect Schematic depiction of the hydrophobic effect
Kitagawa Utamaro, Shaving a Boy's Head. Kitagawa Utamaro, Shaving a Boy's Head.
An impact screwdriver used to remove slotted or Phillips head fasteners that cannot be broken loose ... An impact screwdriver used to remove slotted or Phillips head fasteners that cannot be broken loose ...
A cutaway of a small block Chevrolet V-8 showing the passage from the cylinder head through the ... A cutaway of a small block Chevrolet V-8 showing the passage from the cylinder head through the ...
Clusters of histones in nucleosomes have their N-terminal tails Clusters of histones in nucleosomes have their N-terminal tails
Video: DNA close up Animation

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