Central Park gets all the attention, but Prospect Park in Brooklyn is its equal in urban landscape architecture and as a center of activity for its borough. Designed by Frederick Law Olmstead and Calvert Vaux 150 years ago, today Prospect Park receives more than 10 million visits per year.

Yesterday afternoon I received two strange emails within a few minutes of each other. They both said that someone had shared a Google Doc with me. That by itself wasn't suspicious. Nonprofit technology people love Google Docs and the fact that someone would share a doc without first giving me a ...