Youtube linguist and internet person Tom Scott presents this 13 minute talk about a (thankfully) fictional situation in which a Google engineer removes password protection from all Google accounts, and just what kind of havoc it would do to the world. Never mind if you or your business doesn't use Gmail, you've almost definitely contacted someone who does, making what you thought was private just as vulnerable, and that's the least of your worries.

Tom's an interesting Youtuber - not only does he make videos on linguistics that are fascinating even if it's a subject you don't think you're interested in, he makes films about curious stuff that he thinks you'll like too, like why the London Underground lies.

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This month he's doing a series of daily super-short videos entitled Things You Might Not Know - little pieces of general knowledge that you don't need to know, but might like to.