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Potential answers for the unexpectedly high levels of silica all involve water. The space agency also says it found "a mineral named tridymite, rare on Earth and never seen before on Mars."

What started as a Twitter battle has built up to be an all-out feud between presidential candidates Gov. John Kasich and Donald Trump. A campaign...

Turkey said the plane violated its airspace and that it had issued 10 warnings before firing. Russian President Vladimir Putin said the downing was a "stab in the back by the terrorists' accomplices."

Blue Origin, the space company founded by Amazon billionaire Jeff Bezos, has sent a craft past the edge of space and then landed its rocket safely – and vertically — in Texas.

Scientists have tried for years to grow artificial kidneys in the lab. They've gotten a bit closer by using stem cells to create an "organoid" much like a fetal kidney. But it's missing key parts.

A new, highly automated restaurant in San Francisco looks to speed up service through efficiency. You won't see any people taking your order or serving you at Eatsa, a fast-casual quinoa eatery.

Only one person can win the presidency in 2016, and some of the 22 running have scant chance of victory. So why are they in the race? Many hope luck is on their side, but some might have other goals.

A New Jersey high school teacher used the rapper's latest album to teach a unit on Toni Morrison's novel, The Bluest Eye. Lamar found out about it, and decided to stop in for a visit.

Scientists say lake herring, a key fish in Lake Superior's food web, is suffering because of mild winters and Europe's appetite for roe. Some say the species may be at risk of "collapse."

A long process to ease trading between the U.S. and 11 Pacific Rim nations is closer to being finalized, as negotiators cleared hurdles on how to handle everything from cars to dairy products.