To understand rivers, let physics be your guide
New book explores science of waterways
![River in Egypt](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/03/030717_LH_reviews_river-flows_main.jpg?fit=860%2C460&ssl=1)
WINDING WATERWAYS Aerial views of watersheds like this one in Egypt can take on fractal-like appearances, with large rivers branching into ever-smaller streams.
Google Earth