If you’ve noted videos of brooms standing up all on their own on your popping up on your social media feed like some sort of Fantasia-like sorcery, you’re not alone. The viral craze has participants trying to balance their broomsticks upright — hence the name #BroomChallenge. A new phenomenon, this is not. It’s simply the latest resurgence of an old myth helped along on Monday with a tweet purporting that NASA had proclaimed that Feb.