Cutting-edge DNA tests on Thomas Jefferson’s hair have provided “extraordinary proof” he sired children with slave Sally Hemings — and the process bizarrely also helped nail serial killers such as Rex Heuermann.

Researchers at the Smithsonian Institution compared the genome sequence in a few strands of hair from the head of the United States’ third president with DNA samples from 13 people believed to be the living descendants of Jefferson and Hemings, the New York Times reported.

Speculation that Jefferson had children with his slave has swirled since the early 19th century, but now, after 15 years of work, the team of archaeologists…

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