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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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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 first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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