National

President Obama likes to say he has run his last campaign. But he's determined to give Hillary Clinton a running start toward her own November election, mindful that much of his legacy depends on her crossing the finish line into the White House.

"I'm ready to pass the baton," Obama told supporters at a joint rally with Clinton in Charlotte, N.C., earlier this month. "I know she can run that race: the race to create good jobs, and better schools, and safer streets, and a safer world."

When Joe Biden takes the stage at the Democratic National Convention on Wednesday night, there is probably a part of him that still wonders, "What if?"

But his own White House dreams and reported rivalry with Hillary Clinton will have to be in the rearview mirror in order for him to deliver a home run endorsement, starting on stage and continuing through November.

It's summer, and whether you're 5 years old or 105 it's time to play.

To inspire you, the NPR Ed Team called up leaders and designers at 10 of the nation's best children's museums and asked them one simple question:

What's the one thing under your roof (or maybe out back) that kids and their grown-ups love to do/see/touch/play the most?

Here are their answers, our summer "playlist."

1. Adventure Expeditions — Port Discovery Children's Museum, Baltimore.

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

Copyright 2016 NPR. To see more, visit NPR.

Copyright 2016 NPR. To see more, visit NPR.

Copyright 2016 NPR. To see more, visit NPR.

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

Jonathan Goodman can recall most of the lectures he's attended at the Stanford University School of Medicine. He can recite detailed instructions given more than a year ago about how to conduct a physical.

But at the end of his second year, the 27-year-old M.D.-Ph.D. student could not remember any class dedicated to addiction medicine. Then he recalled skipping class months earlier. Reviewing his syllabus, he realized he had missed the sole lecture dedicated to that topic.

"I wasn't tested on it," Goodman says, with a note of surprise.

Hundreds of Bernie Sanders supporters walked out of the Democratic National Convention in protest Tuesday, after the roll call vote of state delegates was completed with Hillary Clinton officially receiving her party's presidential nomination. The walkout came after the Vermont senator moved to nominate Clinton through acclamation, basically turning his delegates over to her.

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