Preface.- Prologue: inside the energy walls of our cradle.- Gravity at small distances.- New fundamental forces of Nature?.- The graviphoton and the dilaton.- Chamaleons and fat gravitons.- New dimensions of space?.- The compact scenario.- The Kaluza-Klein towers and the radion.- A spontaneous compactification.- The brane-world scenario.- The geometric confinement of gravity.- Gravity at large distances.- Extra dimensions strike back.- A new form...