The Summer Reading Challenge of Green Apple Books and Friends and Neighbors, in San Francisco, Calif., kicked off last Sunday with rousing reading music from the Lowell High Drum Corps. The challenge runs through September 21; last year's edition was highlighted in a recent New York Times article about how summer reading challenges, which used to focus on kids, have expanded to include challenges for adults. The Green Apple/Friends and Neighbor challenge rewards readers for how many hours they read.