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Anti-Theft Device Keeps Shopping Carts On The Job

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 Science   |   Technology
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Shopping cart wheels are made from the same material as roller coaster wheels. Every cart must be tough enough to haul groceries for a decade. At a cost of $100 each, shop owners are keen to keep these rugged buggies on the job. Meet the hidden device that helps keep them out of the hands of thieves and close to home.

MACHINES: HOW THEY WORK
Thursdays 10/9c on Science
http://www.sciencechannel.com/tv-shows/machines-how-they-work/

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