A man failed a paternity test only to discover that his unborn twin is the biological father of his son. The explanation? He's actually a living chimera, the fusion of two separate people, living as one. Jeff and Anthony unpack this story and try to figure out how and why this kind of thing could happen, and what it means for everyone involved.

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Today’s story was sent in by Lisa Fountain: http://www.iflscience.com/health-and-medicine/man-failed-paternity-test-because-he-chimera-his-unborn-twin

If you’ve seen a story you think belongs on the show, send it to [email protected] or leave it on the subreddit: http://reddit.com/r/wehaveconcerns