Piece of Glass Or Transparent Plastic On Mars!

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Youtube User: whatsupinthesky37 -Thanks to Ned for sending this Curiosity Rover picture over that shows a piece of glass or plastic on Mars! Please comment and let us know what you think! I will come back to this picture later I am in a hurry today. Thanks! I misspelled piece of glass in the video. Oh Well ;) Here is a link to the picture: http://mars.jpl.nasa.gov/msl-raw-images/msss/00665/mcam/0665ML0028330030303569E01_DXXX.jpg