For the first time, NASA's rover Curiosity used its on-board drill to collect a sample of Martian bedrock that might offer evidence of a long-gone wet environment, the U.S. space agency reported on Saturday. Drilling down 2.5 inches into a patch of sedimentary bedrock, Curiosity collected the rock powder left by the drill and will analyze it using its own laboratory instruments, NASA said in a statement. This is the first time a robot has drilled to collect a Martian sample. Images of the hole, along with a shallower test hole nearby, can be seen at http://www.jpl.nasa. ...