If you've dabbled in Christmas decorations with traditional Christmas lights, you'll know that when one bulb blows, the entire line goes out with it. Why is that? Because of how the manufacturers wire them.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/NOIWCK05u4s/why-do-all-the-christmas-lights-go-out-when-only-one-bulb-blows
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