Gullies on a Martian dune inside Russell Crater show how descending ice blocks built up levees along their path. (Image: HiRISE (PSP_001440_1255_RED), NASA/JPL/University of Arizona) Could the Red ...

This has been a winter full of surprises. The Philadelphia area has seen the biggest snowstorm in 10 years and one of the longest below-freezing streaks in our history. Nearly every day since ...