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Pérez died on Friday at age 67. In a career that spanned over four decades, Pérez's meticulous pencil was behind some of the biggest comic book heroes.

Stanford mathematician Keith Devlin talks with NPR's Scott Simon about the idea of using logic and quantitative reasoning puzzles to screen job applicants in the high-tech industry. Long a niche recruiting tactic, the method was popularized by Microsoft in the 1990s.

Students from Ukraine are among the finalists in this week's Regeneron International Science and Engineering Fair. They're researching topics from cancer treatments to cockroaches.

A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

A passenger on board the Amtrak train that crashed into a truck and derailed in Missouri on Monday, killing four people, has described the harrowing moment when his carriage rolled.

A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

Ukraine's National Opera was built to celebrate Russian opera at the height of the imperial era. Performances were suspended after the war began but have recently re-started.

The Biden administration will invoke the Defense Production Act to increase U.S. manufacturing of solar panels while declaring a two-year tariff exemption on panels from Southeast Asia.

While some cardinals have sidestepped political discussions, Cupich spoke out against gun violence on Twitter hours after the shooting at Robb Elementary School.