This book is full of experiments and information on movement. It tells how things work. You can test reactions, find out how fast you can run, and even hold water in an open container which is upside down.
Two orphaned teenage girls in New York's tenements in 1883 realize that their dream of saving enough money to move to Brooklyn across the newly-built bridge may be achieved if they learn new trades at a nearby settlement house, rather than continuing their lives of prostitution and stealing.