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https://euzicasa.wordpress.com/2014/12/02/just-ffew-hours-until-program-airs-double-dipping-dig-mouth-dig-2x-national-geographic-an-experiment-forces-people-to-think-about-what-theyre-doing-when-they-dip-a-chip/
Double Dipping (dig-mouth-dig 2X)"| National Geographic (An experiment forces people to think about what they’re doing when they dip a chip)