Nightly News   |  October 21, 2014

Test of Lincoln DNA sought to prove cancer theory

May 4: A physician and author has a theory about why Abraham Lincoln was so tall and why he appeared to have thickened lips. The doctor contends the 16th president had a rare genetic disorder and his request for DNA testing has posed an ethical and scientific dilemma for a small Philadelphia museum. NBC's Janine Brady has details.

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