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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.