Can you guess the subject of this photo?

The Wellcome Trust — a London-based medical research charity — has just announced the winners of its 2012 image competition, and they are positively stunning. Take the scanning electron micrograph featured above, for example. Can you guess the subject of the photograph? It may be the most widely consumed psychoactive drug on Earth, but it looks awfully unfamiliar at this level of detail.

Figure it out? They’re caffeine crystals, jumbled together into structures that measure just 40 microns in length. (As a point of reference, 1 millimeter = 1,000 microns).

via Can you guess the subject of this photo? 

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