In 1924, two climbers named Andrew Irvine and George Mallory died atop Mount Everest. Neither of their bodies was ever found, and the cause of their deaths has remained a mystery. The NOVA: "Lost on Everest" project seeks to find Irvine and Mallory and identify their remains by DNA profiling. Even after more than seventy-five years, DNA profiles should be possible. This interview with DNA lab technician Gill Rysiecki tells how.
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