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Storified by David Lewis· Sun, Mar 31 2013 04:06:57
Ever sat on a train, with a laptop, and watched all those wireless base stations appear and disappear on your screen? We live in a teeming ocean of wi-fi. The air is a soup of data, and don’t you ever worry that something else might be swimming along inside it? Well, if you haven’t worried so far, you might be about to start. Because here’s a gentle warning — sometimes you might see some strange alien symbols appear in your wi-fi menu. don’t click on them. just don’t click. Because that means there’s a Spoonhead really close.