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

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

In the 1500s, an Italian scientist named Giambattista della Porta made a discovery near and dear to many a frozen dessert lover's heart: By mixing salt and snow, you could lower the melting point of ice.

Della Porta used this discovery to freeze wine in a glass of salt and ice. Specifically, he took a vial of wine, added a dash of water and immersed it in a wooden bucket full of snow mixed with saltpeter, then turned the vial round and round. The saltpeter made the snow colder than it would have been otherwise, allowing the wine inside the vial to freeze.

In a report on Monday, Human Rights Watch described a harrowing series of events that took place less than a mile from a U.N. base in South Sudan's capital, Juba. On July 11, the report said, dozens of men in government uniforms "ransacked and looted" a hotel compound, first killing a South Sudanese journalist and then assaulting and raping aid workers staying there.

The U.S. Department of Transportation released a statistic on Wednesday that should surprise no one who flies: In the first six months of the year, nearly 1 in every 5 flights was delayed.

Flights can be delayed for reasons ranging from bad weather to mechanical problems, but airlines know delays are a problem.

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

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

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

One story that's simmering at the Olympics in Rio de Janeiro has to do with sex: in particular, the controversy over intersex athletes, who are anatomically and genetically ambiguous.

At issue: Is it fair to allow those athletes, who often have high levels of testosterone, to compete with women?

Much of the attention has focused on South African runner Caster Semenya, the favorite to win gold in the women's 800 meters on Saturday. Semenya has been identified as intersex in many media reports, though she has never confirmed that or spoken about it.

Bobby Hutcherson, a vibraphonist whose improvising and composition helped to define modernity for jazz as a whole, has died. He had long struggled with emphysema. He was 75.

As a mallet percussionist, he expanded the scope of what was possible on his instrument. And the sound he created was widely influential.

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