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Replacing fossil fuels with renewable energy to combat climate change will require trillions of dollars in investment. Cheap prices for fossil fuels are making that transition a bit more complicated.

Ammon Bundy is asking the remaining armed militants occupying a national wildlife refuge in Oregon to stand down and return home to their families. Bundy was arrested on Tuesday.

DeLorean Motor Company, which hasn't made a car in more than 30 years, plans to build several hundred replicas of the stainless steel, gull-winged car featured in the movie trilogy Back To The Future.

The wheelchair is part of Lego's City line and will go on sale in June, according to Lego's spokesperson in Britain and Ireland.

Mexican authorities said they put Ethan Couch on a plane in Mexico City. The 18-year-old, who was on probation for killing four people while driving drunk, had fled to Mexico with his mother.

Scientists need curiosity, determination — and luck. We're especially interested in that last bit, so tell us your stories of mistakes and surprises that led to discoveries in the past few years.

Clay tablets show that Babylonian astronomers tracked planets using a method that was thought to be invented 1,400 years later. In a way, scientists say, the ancient techniques were "very modern."

The Centers for Disease Control and Prevention and the National Institutes of Health say they're working to combat Zika. Their plans include developing lab tests and a vaccine.

Now out of an Iranian prison, Washington Post correspondent Jason Rezaian thanked his colleagues on Thursday for working for his freedom.

The Republican presidential candidates meet in Des Moines, Iowa, Thursday night for their final debate before the Iowa caucuses. Donald Trump will not be there, amid a feud with debate host Fox News.