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Embed iframe src "https://www.npr.org/player/embed/968710172/968827605" width "100%" height "290" frameborder "0" scrolling "no" title "NPR embedded audio player" Facial recognition researcher Joy Buolamwini stands for a portrait behind a mask she had to use so that software could detect her face. Buolamwini's research has uncovered racial and gender bias in facial analysis tools sold by companies such as Amazon that have a hard time recognizing certain faces, especially darker-skinned women. Steven Senne/AP toggle caption Steven Senne/AP Facial r...

Science Photo Libra/Getty Images hide caption toggle caption Science Photo Libra/Getty Images Electrical circuit with lemons. A chemical reaction between the copper and zinc plates and the citric acid produces a small current, that is able to power a light bulb. Science Photo Libra/Getty Images We're going "Back To School" today, revisiting a classic at-home experiment that turns lemons into batteries — powerful enough to turn on a clock or a small lightbulb. But how does the science driving the "lemon battery" show up in those household batteries we ...

Dominique Faget/AFP via Getty Images hide caption toggle caption Dominique Faget/AFP via Getty Images A macaques monkey looking into the mirror of a motorbike in the grounds of a temple in Jaipur in the Indian state of Rajasthan. Dominique Faget/AFP via Getty Images Daniel Povinelli was in high school when he first read about a clever experiment, published in 1970, that showed chimpanzees—but not monkeys--can recognize themselves in mirrors. "I bought into the story of mirrors and self-recognition hook, line, and sinker," he recalls. "Because it is a...