In the frigid New York winter of 1910, experimental biologist Thomas Hunt Morgan etherized a family of fruit flies and began sorting through their sleeping forms. After a while he saw something unusual—a ﬂy with white eyes. In all his time studying Drosophila melanogaster, Morgan had seen only red eyes, or more specifically, red compounds with 760 individual lenses. What confronted him now was a rare genetic mutant. He bred the fly, eventually yielding a cohort with those same ghostly features. His experiment established the material basis of heredity in the chromosome, providing an essential “How?” that had been missing from Darwin’s theory of evolution. This story is from Kinfolk Issue Twenty-Eight Buy Now Related Stories Arts & Culture Issue 19 Going Incognito We all secretly wonder what mischief we’d make if invisible: When our identity is hidden, everything seems possible. Arts & Culture Issue 19 The Best Policy Sometimes we talk to each other without feeling heard. Honesty—a most intimate interaction—can be just as thrilling as its more devious inverse. Arts & Culture Issue 19 A Sense of Suspense With unhinged imaginations and mountains of cliff-hangers, the filmmakers behind the sci-fi podcast Limetown have all the makings of a scary story. Arts & Culture Issue 19 Like Clockwork In this new column about time, we learn how slipping off our watches makes us feel like deadline-damning renegades. Design Issue 19 In Anxious Anticipation The effects of adrenaline are positively pulse-pounding, but the physical whoosh we feel in our bodies actually starts in our brains. Arts & Culture Music Issue 19 On a Grander Scale Malaysian singer-songwriter Yuna now may live on the opposite side of the globe, but she’s determined to evolve while staying true to her roots.