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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 ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
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The familiar sounds of your heart are made by the heart's valves as they open and close.