An anonymous reader writes: These days, we've got it pretty good. We can talk to people on the other side of the world within seconds, have anything from takeout food to a plastic container of ladybugs sent straight to our doors, and leave home without taking all our valuables with us. But for a long time, people didn't have it so easy, and taking care of the important stuff — like home security — required some ingenuity. Read on to find out how we got from squeaky floors and sharp sticks to closed-circuit cameras and "protective beds."
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