The most striking images from the world of science this week: including an anniversary on Mars, a maze of 1.5 million books ...

NPR's Hannah Chinn and Emily Kwong talk about the microbes behind great-tasting chocolate, possible reasons for daytime drowsiness, and a curious observation about the poop of seabirds.

Two meteor showers —the Alpha Capricornids and Southern Delta Aquariids — reach their peaks this week. Here’s how to observe ...