books.google.com - Defying Gravity tells the astonishing story of how gravity pioneers transformed an ancient terror—the sensation of falling—into the modern thrill that powers extreme sports, monstrous amusement rides, and a youth culture obsessed with "getting air." It's a hair-raising tour, with nineteenth-century...http://books.google.com/books/about/Defying_Gravity.html?id=B4K0rfx_E_kC&utm_source=gb-gplus-shareDefying Gravity
