One Response to “Signals”

  1. Donald Stockley says:

    Even better than CD/DVDs are Hard drive platters. They are a little smaller than CD/DVDs and much more sturdy and have a better mirrored surface. They have the same hole in the middle for tracking. I use dark duct tape on one side in my hiking kit that has duplicate purpose in that it keeps you from getting accidentally blinded and a place to store a little bit of duct tape that can be peeled off for later use.

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