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A few months ago, co-Host Latif Nasser, who was otherwise healthy, saw blood in his poop. It was the start of a medical journey that made him\\xa0not only question what was going on in his body, but also dig into the secret genetic\\xa0story of how we became human. Curled up in a hospital bathroom, Latif tries to sort out whether his\\xa0ordeal\\xa0is the result of a long-lost sibling knifing him in the gut or, on the contrary, a long-forgotten kindness shared between two human-ish travelers.\\xa0

Special thanks to Azra Premiji,\\xa0Avir Mitra, Suzanne Lehrer,\\xa0David Reich, Sriram Sankararaman,\\xa0Ainara Sistiaga,\\xa0Carl Zimmer,\\xa0Carly Mensch, Nihal Kaur,\\xa0Charlotte Hsu and Bert Gambini at the University at Buffalo Media Relations, and Latif\'s\\xa0GI Doctor Florence Damilola Odufalu and her entire team,\\xa0as well as all\\xa0the staff at LA County-USC Medical Center and Keck USC hospitals who looked after Latif during his hospitalization.

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Radiolab is on YouTube! Catch up with new episodes and hear classics from our archive. Plus, find other cool things we did in the past \\u2014 like miniseries, music videos, short films and animations, behind-the-scenes features, Radiolab live shows, and more. Take a look, explore and subscribe!Editorial Note:\\xa0This podcast was amended after initial release to change the way we refer to those afflicted\\xa0by addiction.\\xa0