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Caffeine Crystals

SEM of caffeine crystals



COURTESY OF ANNIE CAVANAGH AND DAVID MCCARTHY Wellcome Images

The world's most popular psychoactive drug, caffeine, is a crystal that grows in the seeds, fruit or leaves of many plants. This image was made in black and white using an electron microscope and then falsely colored in vibrant hues. The photograph won one of this year's Wellcome Image Awards.

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