The human genome contains 20,000–25,000 protein-coding genes — about the same as a roundworm.
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In 1953, Watson and Crick described the double-helix structure of DNA.
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DNA carries genetic information in living organisms.
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Insulin was first used to treat diabetes in the early 1920s.
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Dark matter is believed to make up most of the universe’s mass but has not been directly observed.
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Antifreeze proteins allow Antarctic fish to avoid ice crystal formation.
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Time moves slower in stronger gravitational fields.
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The human brain generates enough electrical activity to power a small light bulb.
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The use of ultrasound improved prenatal care.
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