The male Y Chromosome holds tantalizing clues about our own, personal past - but that past can turn out to be very troubling. Tatiana Zerjal's research on DNA samples brought by Spencer Wells from central asia revealed uncomfortable truths, such as the extend of rape and murder in Genghis Khan's Mongol empire. Dr. Karl Skorecki's interest in his priestly Jewish origins has the potential to sow division and strife amongst jews. Do we really want to know the secrets our DNA holds?

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