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James Pampush devoted five years and his Ph.D. dissertation to one question: Why do homo sapiens have chins, when all of our evolutionary relatives don't? He tells NPR's Robert Siegel about "the enduring puzzle of the human chin."

Project Nourished uses a variety of tricks to fool the mind into thinking it's eating. The goal: to let us consume our favorite tastes without unwanted extras — like food allergens or just calories.

Republican presidential candidates had their final debate before the Iowa caucuses Thursday night. NPR's fact-checking team takes a closer look at some of the claims the candidates made.

The government is proposing to require employers to report pay data by race, gender and ethnicity. The president is using executive power to make the rule change, which is set to take effect in 2017.

NPR's Robert Siegel speaks with our regular political commentators, E.J. Dionne of the Washington Post and Brookings Institution and David Brooks of The New York Times about the week's political news.

NPR checks in with Iowa voters ahead of their state's caucuses, the first nominating contest of the presidential election, on Monday.

Researchers have uncovered a juicy tidbit that could be the parasite's undoing.

Scientists studied the genomes of more than 64,000 people and found that those with the debilitating psychiatric disease were much more likely to possess mutations of a particular gene.

The State Department will not release 37 pages of Clinton emails because they are top secret. The latest turn in the controversy of her private email server comes days before the Iowa caucuses.

The state now will recognize concealed-carry permits from other states. In exchange, control advocates got more stringent laws on gun shows and protection for domestic abuse victims.