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Astronomers have found a distant dwarf planet that appears to confirm the existence of Planet Nine, a giant planet lurking in the outer reaches of the solar system.

Amborella is the first known flowering plant and, like the platypus, a genetic dead end. Selaginella's relatives are the fossils in fossil fuel. Now, scientists are studying the genes of these plants, looking for clues about evolution and compounds that might be applied to medicine or agriculture.

While the new government in Kiev plans to withdraw its 25,000 troops from the region, the orders weren't immediately given. One issue: Can they take their weapons with them?

Health care costs grew at 3.7 percent in 2012, the fourth year of a trend of smaller annual increases. The Obama administration says that the Affordable Care Act is a factor. But the actuaries who wrote the report beg to differ, saying the recession is a more likely cause.

In the fast-moving migrant crisis, here's a snapshot of the key figures.

They're kids' new best friend and some teachers' worst nightmare. And despite being marketed to help ease anxiety and ADHD, one expert says there's no research to support that claim.

After a 10-day search off the coast of Somalia, the SEALs were presumed dead, the U.S. Central Command said. They went missing during an operation to seize weapons headed for the Houthis.

Our most popular global stories of 2023 offer insights into the stereotypes of male hunters/female gatherers, the biases of AI, the best way to end poverty and the impact of a stranger's greeting.

We found joy in mail-order chicks, soothing lullabies, a celebration of long-lasting love, the magic touch that can calm a grumpy child (and even a stressed out adult) and beach day in Mogadishu.

Michigan Gov. Rick Snyder vetoed a bill on Tuesday that would have allowed people with concealed pistol permits to carry guns in schools. He was under widespread pressure to veto it after the school shooting in Newtown, Conn., last week. Robert Siegel talks to Rick Pluta of Michigan Public Radio.