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For Ross Roberts, it was a lack of resources that drove him from the classroom. For Danielle Painton, it was too much emphasis on testing. For Sergio Gonzalez, it was a nasty political environment.

Welcome to the U.S. teaching force, where the "I'm outta here" rate is an estimated 8 percent a year — twice that of high-performing countries like Finland or Singapore. And that 8 percent is a lot higher than other professions.

A drive 30 minutes north of Omaha, Neb., leads to the Fort Calhoun nuclear power plant. It's full of new equipment. There's a white concrete box building that's still under construction. It's licensed until 2033. But the plant is closing Monday.

Nuclear power is expensive, especially when compared to some of the alternatives, so the U.S. nuclear power industry is shrinking. As more plants go offline, industry leaders are forced to reckon with what critics call a "broken system" for taking plants out of service and storing radioactive waste.

When scientists recently announced that they had discovered a new planet orbiting our closest stellar neighbor, Proxima Centuri, they also released an artist's conception of the planet.

The picture of a craggy canyon, illuminated by a reddish-orange sunset, looked like an image that could have been taken on Mars by one of NASA's rovers. But the alien scene was actually completely made-up.

At the Marshfield Clinic dental center in Chippewa Falls, Wis., hygienist Karen Aslinger is getting her room ready. It's all quite routine — covering the chair's headrest with plastic, opening instruments, wiping down trays.

But then she starts getting creative.

Jeffrey Goldberg, The Atlantic's new editor, has had a long career as a reporter, covering Israel, Pakistan and Iran, and spending hours interviewing President Obama.

And recently, Goldberg pressed for his magazine to endorse Hillary Clinton for president. He said it was right, even though it's only the third time in its history The Atlantic has endorsed a presidential candidate.

The final presidential debate between Donald Trump and Hillary Clinton wrapped up last week, but a post-debate argument raged for days afterward: Is Trump saying "bigly" or "big-league"?

Many took to social media questioning what the Republican nominee could be saying.

Some even criticized him, saying bigly isn't a word.

In most cases, when an employer pays a signing bonus to attract new workers, that payment is understood to be essentially unrecoverable. But the Pentagon has a different understanding — and it's ordering the California National Guard to claw back thousands of dollars paid to soldiers who reenlisted to fight in Iraq and Afghanistan.

A tour bus and tractor-trailer collided outside of Palm Springs, Calif., early on Sunday morning, injuring dozens of people and killing at least 13 passengers.

At a press conference on Sunday afternoon, the chief of the local California Highway Patrol division said the bus collided into the back of the truck so forcefully that it traveled some 15 feet into the truck's trailer.

Donald Trump's slogan "Make America Great Again" is an easy one to adapt for whatever your cause. There are ones like "Make America Gay Again," "Make America Skate Again," "Make America Read Again," "Make America Fair Again." You get the idea.

Bakers, of course, had to get in on the action. How could you pass up "Make America Cake Again"?