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<p>[QUOTE=&quot;toddestan, post: 279245, member: 6366&quot;]You could do a project on how vending machines use the electromagnetic signature to detect the various coins.&nbsp; If you could manage to build a device that can identify coins using that method, that would be really cool (I have no idea how complex they actually are).&nbsp; Alternatively, you could also do the project on mechanical sorting, though that would be less &quot;sciencey&quot; if you ask me.[/QUOTE]</p><p><br /></p>

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