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There's a growing effort to actually test whether aid programs work. But how much has it accomplished?

Scientific conclusions and scientific methods can change: Understanding how and why these changes occur reveals why science is our best bet for getting the facts right, says Tania Lombrozo.

Still, Laurie Frankel says, her book is fiction. "The nice thing about my life is that it's pretty boring, which is really how you want your life to be — but not how you want your novel to be."

Santiago Ramón y Cajal's drawings of nerve cells changed scientists' understanding of the brain. Now, 80 of those drawings are going on display at an art museum in Minnesota.

Claims about the size of crowds for both President Trump's inauguration and the protests that followed the day after, are being debated. Scientists struggle with how to do that kind of head count.

If you guessed North America, you're wrong. A new report looks at who's producing the most.

The judge rejected the state's use of midazolam, one of the drugs used in botched executions in Arizona, Ohio, Oklahoma and Alabama. The ruling puts Ohio's next three scheduled executions on hold.

A draft presidential order that could open the door to reviving "black sites" might be as much political messaging as a true plan.

Bolt left Rio with a perfect triple-triple, having won three golds in three consecutive Olympics. But his record unraveled after a re-analysis found his Beijing relay teammate used a banned substance.

President Trump's statements that aren't true challenge many newsrooms. NPR will report what it can verify, says news chief Michael Oreskes.