Scientist-in-training Summer Praetorius has an unusual skill—she is really, really good at spotting four-leaf clovers (Trifolium repens L.). A single gene causes the normally three-leafed clover to produce a fourth, supposedly lucky, leaf. As it turns out, good science depends on both close observation—a skill Praetorius uses to spot tiny shelled animals called foraminifera—and a little bit of luck. Ari Daniel Shapiro explains.
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