To be a sheep is to blindly follow the crowd. But is a sheep's sheepiness really enough to make an entire flock walk around in a circle non-stop for days on end? That's a mystery the internet has pondered for about a week now and solving it has proved more difficult than you'd expect. On 17 November, a news outlet run by the Chinese state, called People's Daily, shared an eerie video on Twitter of dozens of sheep in Mongolia strolling around in tight, almost perfect concentric circles. At the time the video was released, the flock had been tracing…