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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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