Baba Yaga flies her mortar by simply pulling up on the pestle while standing inside the mortar. Brilliant! Like Baron Munchausen pulling himself up by his own bootstraps, the origin of the phrase BTW. Better physics than spacetime, dark matter, darwinism, string theory, the big bang, superposition, radiative transfer, the multiverse, singularities (I could fill the entire box) etc., but that's faint praise.