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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Vaccines prevent between 2.5 and 4 million deaths every year.