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Also: Sen. Bob Corker (R-TN) claims President Trump risks triggering a new world war; Israeli and Palestinian women march for peace; and cleaning up on the Gulf Coast after Hurricane Nate.

The National Academy of Sciences has toughened up its guidelines to call cutting corners, dubious statistics and not fully sharing research methods "detrimental" to science.

The online retailer is introducing a service that lets Twitter users add Amazon.com products to their carts without leaving the social media site.

Kudlow is a longtime free-markets conservative who supports most of the president's policies, but has also criticized some of his trade policies.

Emily Feng is NPR's Beijing correspondent.

Highlights from New York's one-night festival of global sounds included music from Haiti's dance-clubs, Ukrainian experimental theater and Mexican cabarets.

President Nicolas Maduro emerged unscathed after blasts interrupted his televised address. But now, the focus is turning to who was responsible — and how hard the authoritarian regime will retaliate.

Also: The International Paralympic Games open in South Korea; ISIS claims a deadly attack in Afghanistan; and President Obama is in talks with Netflix about producing shows.

Six officers were shot in an incident in North Philadelphia that started with a narcotics unit serving a warrant and went on for hours. Two officers trapped at the site were later evacuated safely.

Also: Relief deliveries are cut off to Eastern Ghouta, Syria; a second nor'easter aims for the Northeast; and the World Cheese Championship opens in Wisconsin.