Ada shook her head, staring once more at the Thames. "I do not think what I had in mind will work. The size of the wing, if it is to be large enough to lift me—my body cannot possibly generate enough force to move it. Not with the speed required." Especially not when she kept growing. Every inch meant more weight for the wings to lift, without a commensurate gain in strength.
Where's it all come from? George wondered. Where you think it comes from? Frank scoffed. It's fields and roads and house lots. It's America, running westwards to somewhere else, anywhere else, someplace maybe better, like Great-Grandpaps did, and like Papa did, and just like we're doing.