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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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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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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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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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Cyanide works by making the human body unable to use oxygen.

A family pedigree of a dominant trait A family pedigree of a dominant trait
Herbivores must overcome the wide variety of physical and chemical defences evolved by plants. Herbivores must overcome the wide variety of physical and chemical defences evolved by plants.
Fights for dominance are normally brief, and sometimes merely displaying dominant gestures without p Fights for dominance are normally brief, and sometimes merely displaying dominant gestures without p
Male giraffe mounting a female. Only dominant males are generally able to mate. Male giraffe mounting a female. Only dominant males are generally able to mate.
Herbivores exploit plants Herbivores exploit plants
Example of a genetic pedigree of the autosomal dominant disease Marfan syndrome Example of a genetic pedigree of the autosomal dominant disease Marfan syndrome
Video: Types of Shock (Part 2 of 2)

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