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It happens to everyone eventually. We innocently hand the cashier a fifty dollar bill, only to have her run a pen across the front of it and flippantly announce that it's counterfeit. In reality, it's very difficult to make counterfeit bills look real. And there are many complaints from consumers that these pens they use at stores don't actually work. Yet, business continue this odd practice, seemingly unhindered by the criticism. In this project we will test the efficacy of these pens, and try to determine how they work, or how they don't.
It is an educational content by education.com.
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Fecha publicación: 12.5.2016
Es respecta la llicència original del recurs.