An anonymous reader writes: Curiosity has wheeled its way over to the low point in Yellowknife Bay and has found veined rocks, evidence that water once percolated through this area. Scientists are excited because it is the first evidence of precipitation of minerals and water. There is also cross bedding that can be seen, thin layers of rocks oriented in different directions. The grains are apparently too course for the wind to have created, alluding to flowing water. Even with this discovery, much is still not known about Mars' past.