Mary Very Easily Made John Some Unusually Nice Pie. This easily remembered mnemonic will need revision. Making pie isn’t easy, and making easy to remember mnemonics isn’t either. Though some may be disappointed at Pluto’s demotion, I’m willing to bet Mary is happy to have scientific justification for dodging her pie baking obligations. Maybe John will discover a bakery when the occasion calls for perfectly round, flaky crust. I wonder, though, if Plutonians haven’t already revised their own mnemonic to account for their demotion of earth as a planet: Plutonians Nearly Underestimate Satellite’s Journey, Mistaking Venus’s Moon….for a planet