Half a croissant, on a plate, with a sign in front of it saying '50c'
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Gum Drop Counter

 Protection for your shoes
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An app that uses a camera mounted on your glasses / lapel to spot gum on the footpath / sidewalk.

It then uses your smartphone to compare the image to a database of known gum spots in that area.

If it identifies a new gum spot in your likely footfall zone it sends a signal to a gyroscopic device in the heel of your shoe to move your foot slightly so as to avoid stepping in the masticated mess.

—UnaBubba, Feb 15 2013

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