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There are many qualities of a great teacher. Two big ones? Kindness and a willingess to make learning fun. At least that's what Marlem Diaz-Brown's fourth-graders say.

For our 50 Great Teachers project, we've searched all over for teachers like her. Which brought us to Sunset Elementary School in Miami ... and "Mrs. D-B."

Donald Trump has called himself the presumptive Republican presidential nominee. But he can't become the real presumptive nominee without first gaining a lot of votes in the California primary on June 7 – the last day of voting on the GOP primary calendar.

It's the first time in decades that California will make a difference in picking the GOP nominee. That's why all three remaining candidates will be speaking at the California Republican Party's convention, which begins Friday.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

So we're about halfway through our 50 Great Teachers project, and we've been looking for ways of shaking it up. We've done photo essays, web comics and videos.

These endeavors brought us to our latest idea: Instead of us reporting the story, let's let the kids do it.

Once we found a great teacher — Mrs. Marlem Diaz-Brown in Miami — we had to be sure she was willing to let us take over her fourth-grade class. And she was.

Sixteen U.S. service members have been disciplined after the Pentagon reviewed the U.S. airstrikes that killed 42 people at a civilian hospital in Kunduz, Afghanistan, last fall.

NPR's Tom Bowman reports that none of the military personnel face criminal charges.

In his lab at George Mason University in Virginia, Sean Luke has all kinds of robots: big ones with wheels; medium ones that look like humans. And then he has a couple of dozen that look like small, metal boxes.

He and his team at the Autonomous Robotics Lab are training those little ones to work together without the help of a human.

In the future, Luke and his team hope those little robots can work like ants — in teams of hundreds, for example, to build houses, or help search for survivors after a disaster.

The 2016 NFL draft starts tonight so here's our comprehensive first-round mock draft.

At first glance, real estate agent Theresa Mondale's listings don't sound too different from those of other agents trying to sell a piece of Montana paradise: 270 acres at the base of the Bitterroot Mountains completely surrounded by U.S. Forest Service land, stands of old growth fir and cedar trees, a spring with pure water.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

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