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We've been recording Tiny Desk concerts for nearly a decade, and in that time, a few artists have come back for encores — folks like Wilco, Chris Thile and the inspiration for the series, Laura Gibson. One band, The Oh Hellos, came back after a year to favor us with a holiday set. But we've never, until now, asked anyone to return later the same day.

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Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Older brains may forget more because they lose their rhythm at night.

During deep sleep, older people have less coordination between two brain waves that are important to saving new memories, a team reports in the journal Neuron.

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