unexplained phenomena Laser-cut by giants? How did this massive rock in the Saudi Arabian desert get split so cleanly? Mark Frauenfelder

volcanoes A volcanic eruption unearthed a pair of sunken ships on Iwo Jima Thom Dunn

Science Here's what this week's Mars space mission will observe Andrea James

Weird Trumpet sounds heard across Jakarta signal end of the world (or not) David Pescovitz

Environment The revenge of the lawn Mark Dery

Science Climate change and earthquakes: It's complicated Maggie Koerth