Walden Media has acquired the screen rights to Michael Reisman's YA series SIMON BLOOM: THE GRAVITY KEEPER, reports Deadline.com. Adam F. Goldberg (FANBOYS) will pen the script. The story follows a trio of tweens who unlock magic-like formulas to control gravity and friction from a book by the Order of Physics. They must stop a woman tattooed with the formulas who is bent on conquering the world.