Scientists say that NASA's Perseverance rover has discovered rocks that are being called the clearest sign of ancient life on that planet. The stones are composed of finely packed sediment. Close analysis reveals that they contain green, black and white dots resembling minerals that on Earth are associated with microbial activity. Researchers say the rocks will require further analysis, ideally in laboratories back here on Earth, before they can reach any firm conclusions. | PBS NewsHour

Archaeologists embark on the biggest dig in a generation at Pompeii. Stream the landmark new series, Pompeii: The New Dig, on the PBS App. | PBS