The Placebo Effect
To test new drugs, researchers usually divide their subjects into two groups. One group receives the experimental drug. The other receives a placebo or 'sugar pill' that should have no effect on the illness. Participants don't know which group they are in. In…
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Biology
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When an egg is fertilized by a sperm cell, it quickly becomes a single cell from which all cells of the…
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Our Most Abundant Fossil Fuel
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