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Seventy years ago this week, in the New Mexico desert, U.S. Army scientists detonated the first atom bomb. NYU physics professor Benjamin Bederson was among those who worked on the Manhattan Project.

Once tucked away in Google's "Labs" space for beta testing, the "Undo Send" option now gives users 5 to 30 seconds after sending an email to change their minds.

A woman who suffered burns to 90 percent of her body has died. Investigators are looking at what caused powder sprayed from the stage during a performance to catch fire. Nearly 500 people were burned.

International negotiators appear close to a deal limiting Iran's nuclear program. NPR's Peter Kenyon reports from Vienna.

Among those caught up by Nepal's devastating earthquake, were hundreds of tourists. Those included four hikers from California, who were trapped in a small mountain village.

The agency also unveiled new forecast graphics that are more detailed and highlight threats posed by potentially deadly storm surges.

The International Sailing Federation says the move is prompted by concerns over athletes' health and safety, after reports of raw sewage and trash in the water around Rio.

A very large cat has been roaming the streets of Milwaukee's central city and it has residents on edge. A number of witnesses claim it is a mountain lion. No one has reported their "pet" missing.

In an interview with NPR, Ernest Moniz says the deal has expanded the time it would take Iran to make a bomb significantly — from two months to a year.

Turkey is gradually allowing minority populations more avenues of expression, including in the arts. This week, thousands attended a rare and moving Istanbul performance of Armenian music and poetry.