KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Aspirin crystallisation. Time-lapse polarised light microscopy footage of the formation of crystals of aspirin (acetylsalicylic acid). This analgesic (pain-relieving) non-prescription drug is used to relieve general pain such as headaches. Aspirin is also used to thin the blood, which reduces the risk of blood clots that can cause heart attacks and strokes.
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