What Goes Up Must Come Down Author:Johanna Hurwitz, Ingrid Fetz (Illustrator) When Margot's family moves into a penthouse apartment in a building in NYC, Margot's mother decides that there's no reason for her ever to go downstairs again! She's perfectly happy baking, tending their roof-top garden, listening to classical music...But as part of a science project about the Law of Gravity, Margot decides... more » that her project will be to tempt her mother back downstairs with every hare-brained scheme she can think of...but nothing works and time is running out!« less