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The U.S. tested similar concepts in the 1960s but abandoned them over concerns of radioactive contamination. Russia's claim seems so fantastic that some analysts didn't believe initial reports.

Tuesday was busy day at the Supreme Court, as it handed down a decision that could ensure long-term detentions for immigrants and heard arguments in an email privacy case that seemed to have the justices leaning against Microsoft.

Bolton takes the job as two major foreign policy challenges come to a head, in North Korea and Iran. He replaces H.R. McMaster, becoming the third man to hold the position under President Trump.

A scientific project for killing invasive green iguanas in Florida has become the center of national attention. Anthropologist Barbara J. King looks at wildlife management and methods.

According to inside accounts, the president and McMaster clashed when the top aide's cerebral briefings crashed into Trump's more freewheeling style.

Hours earlier, the president had hinted at vetoing the legislation but relented, citing "national security." The threat added suspense to what otherwise would have been a perfunctory signing ceremony.

Congressional Republicans would not go as far as the president. Sen. Marco Rubio said he remained confident that special counsel Robert Mueller is "fair and thorough" and will "arrive at the truth."

The state says the permit expires Saturday. Uber itself says it won't seek a renewal. Hours earlier Arizona Gov. Doug Ducey announced he's suspending testing there, where the death occurred.

The World Bank looked at economic data from around the globe to see where the gap between the rich and the poor is the greatest.

In Catherynne M. Valente's new novel, a washed-up glitter punk musician has to save all humanity by singing in an intergalactic version of the Eurovision Song Contest. (Also, there are murderhippos.)