Here's a cautionary tale about why, if you're a computer user, you shouldn't trust anyone: Not even your antivirus software. Avast, the free antivirus I've been using, and recommending for while, nearly gave me a heart attack the other day, via a nasty double whammy: wrongly identifying pretty much every program on my computer as a Trojan Horse virus, and then not telling me it had made a mistake. Antivirus software works like this: It keeps a library of bits of viruses it knows about it, and it compares those bits with everything on your computer. If it finds a match, warning sirens go off.
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