Some geniuses over in Japan have finally unleashed the next generation of mood rings with these things: tails. These are actual furry devices you can wear that read your mood (through means we’re not sure we even want to know) and will wag if you’re happy or droop if you’re sad. So now, everyone with a clear view of your tail will not only know what kind of mood you’re in, but also will probably be able to tell a lot more about you from the fact that you’re the sort of person who wears a robotic, mind-reading tail …