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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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There are more bacteria in your mouth than there are people in the world.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.