The HiRISE has uncovered a wealth of information in a canyon bank at Chasma Boreale at Mars’s north pole. Here, the canyon has eroded to reveal layers of minerals and other materials. The layers are rich in water ice, while the dark material toward the bottom is most likely sand dunes. These layers are helping scientists decode Mars’s recent climate variations.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.