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Trump warned Saturday that Iran would soon "be hit very hard," adding that the U.S. may expand its target list to "new areas and groups of people."

When a species is facing extinction, it takes an enormous human effort to stave it off. Case in point: the painstaking campaign to save the frosted flatwoods salamander.

Talking to AI bots can lead to unhealthy emotional attachments or even breaks with reality. Some people affected by chatbot interactions or those of a loved one are turning to one other for support.

An NPR investigation found that people in the U.S. are dying from heat much more often than official counts show. We explore the reasons why — and how lives can be saved.

The Iranian government has declared 40 days of national mourning after Khamenei was killed in a U.S.–Israeli attack on Saturday.