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American history repeats itself often enough that we sometimes feel like we are living in an infinite loop. Here is a quiz that explores that notion.

Public health officials were surprised last year when the dominant strain of circulating flu mutated after the flu vaccine had been formulated. The current version looks like a better match.

Flights have resumed after what the airline called connectivity issues caused ground stops in Dallas, Chicago and Miami.

There are rumblings that conservatives want John Boehner ousted as House speaker for what they see as a lack of fight. But GOP leaders look ready to turn the tables on the insurgents.

The Federal Reserve decided to leave interest rates unchanged at historically low levels, even though the U.S. economy has been gaining strength. The Fed has kept a key rate near zero since late 2008.

Clinton has struggled to seem at ease on the campaign trail given the controversy surrounding her use of a private email server as secretary of state. She broke through that Wednesday night.

President Obama met with the three Americans credited with stopping an alleged terrorist attack on a Paris-bound train in the Oval Office to honor them for their actions.

Kids' fast-food habits haven't budged in the past 15 years, a study by the CDC finds. The marketing, cost and taste of fast food still seem to have a hold on America's youth.

Scientists spent decades arguing that women weren't suited for space travel because of menstruation. Even now, a lot of us are wondering how astronauts manage that time of the month.

A new study on Inuit in Greenland suggests that Arctic peoples evolved genetic adaptations that allow them to get by mostly on seal blubber and meat without developing health problems.