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Description for the photo above:
Aspirin was originally extracted from willow bark but is actually produced in all plants as a defence mechanism in response to damage or attack. Much higher levels are therefore found in less than perfect fruit and vegetables. Aspirin is used to treat pain, reduce fever, and prevent heart disease and cancer. Some people think it should be reclassified as a vitamin. Colour-enhanced scanning electron micrograph by Annie Cavanagh and Dave McCarthy.[Via Make.]