This is probably a dumb question. But is there any specific reason why they don't have a microphone on-board curiosity? Is it just a cost/benefit thing? Even though a microphone probably won't be as useful as a camera, I still would of thought the extra weight would be negligible, and it's a unique device or data gathering. I always wondered what it sound like on another planet. Or even a recording of the landing process. A mars dust storm would be amazing also. I know most people will just say it's pretty similar to Earth, so why bother, I still think it'd be interesting anyway.