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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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Thyroid conditions may make getting pregnant impossible.
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Cyanide works by making the human body unable to use oxygen.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.