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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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The horizontal fraction bar was introduced by the Arabs.
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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The longest a person has survived after a heart transplant is 24 years.