Dear Dr. Height, it is your time to rest.

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And of course, I have to recognize my partner and dear friend, Dr. Jill Biden.

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Dr. NICOLE LARIER(ph) (Physician, Durham, North Carolina): Dear Heavenly Father, thank you for bringing us together.

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But it may not be the only cause, and Dr Tuljapurkar has come up with a purely genetic explanation of a sort that would have been dear to Hamilton's heart.

ECONOMIST: Evolutionary biology

I'd also like to thank to Dr. Jill Biden -- a Blue Star Mom, by the way -- and a dear friend of mine as well.

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