That is interesting about the mythbusters. I asked the CM who was checking us in about this and he told me to keep it away from absolutely everything because the cards are very finicky. The biggest thing he said was to make sure to never put two cards back to back, you could put them front to back and that would be ok. To be on the safe side each of our cards got their own pouch in each or our bags, they never touched anything except the inside of the bag.