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Have you ever wondered why walkers have only 2 wheels and 2 tennis balls?

anthony davis @lookatdesktop (27156) • Dallas, Texas 18 Mar 16

That's right. I see these people with walkers who have two wheels in the front but two tennis balls on the back legs of their walker. Why is this? There are of course, the deluxe models that have 4 wheels, a folding seat, a basket...

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