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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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