Who'd be stupid enough to put an actual nuclear reactor in the middle of London? Well, the Royal Navy, for more than thirty years, at the Old Royal Naval College in Greenwich -- that place that got blown up in Thor 2. It's not quite as bad as it seems, though. Thanks to David and Oli for sending this in, and to Rob Blake on camera! PS: here's my favourite Thor joke. A man in a Viking helmet with a giant hammer walks into a bar. The bartender says "hey, are you Thor?" And the man replies, "No, I alwayth walk like thith."