Science

NASA photos show new signs of a lake on Mars
In the huge Gale Crater where Curiosity has been exploring, the water and sediment flow might have been massive enough to build a mountain.
Sources: FAA may require licenses to fly commercial drones
The FAA has been struggling to write the rules for unmanned aircraft like the ones Amazon and other companies are developing. But a proposal is expected before year's end.
Walter Isaacson on the digital revolution
Aspen Institute CEO Walter Isaacson speaks at the Computer History Museum about his new book, "The Innovators: How a Group of Hackers, Geniuses and Geeks Created the Digital Revolution."