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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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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.