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Hillary Clinton was back on the campaign trail today. After taking three days to rest from pneumonia, Clinton entered her event with some specially chosen music for the occasion.

(SOUNDBITE OF SONG, "I GOT YOU")

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ARI SHAPIRO, HOST:

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

KELLY MCEVERS, HOST:

There was a time when the most frustrating thing about summer road trips were the lines at the toll booth.

Remember digging through the seats for exact change or scrambling to find the shortest line? Toll collection has come a long way, from handing money to cashiers to simply driving through the booth with an E-ZPass.

But the technology passed through many, often surprising, hands — musicians and spies and NASA scientists — to become the electronic toll booths many highways enjoy today.

'Music Out Of Thin Air'

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KELLY MCEVERS, HOST:

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