The horizontal fraction bar was introduced by the Arabs.
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There are more bacteria in your mouth than there are people in the world.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
Models for the electron orbitals and energy shells of carbon
Activation energy of a chemical reaction
Methane combustion as an energy–yielding redox reaction.