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After 58 Years Of Service, John Dingell To Vacate House Seat

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Democratic Rep. John Dingell of Michigan is the longest-serving member in the history of Congress. The 87-year-old announced on Monday that he will step down at the end of this term.

WATCH: Obama Reads 'Mean Tweets' — Including One From Trump

President Obama returned to ABC's Jimmy Kimmel Live on Monday. He took 140-character admonishments for his dancing, his alleged condiment preferences and someone else's poor choice of conditioner.

Dental Detectives: What Fossil Teeth Reveal About Ancestral Human Diets

From the thickness of tooth enamel to the molecular signatures on a tooth left behind by foods eaten by a human, fossil teeth hold many clues to the diets of our ancestors.

Two Weeks Out: Democrats Have The Edge In The Fight For The Senate

States like Pennsylvania, New Hampshire, Missouri and North Carolina will be decisive, and they're all moving Democrats' way as Republicans are put further on the defensive by Donald Trump.

Applying A Silicon Valley Approach To Jumpstart Medical Research

Neuroscientist Cori Bargmann is leading the new Chan Zuckerberg Initiative's $3 billion effort to cure or prevent "all diseases" by the end of this century. She talks about that daunting task.

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