Sometimes we can get ideas for services for the BOP from what the rich do with their smartphones and computers: The same day, my brother sent along a link for a new app (leafsnap) that allows users to identify trees by submitting photos of leaves. What a smart way to juice that nature walk, I thought. The next day I saw a Twitter message from Pierre Omidyar (@pierre), the eBay founder, in which he attached a photo and asked, “What is the name of this purple and white flower bush?” Seconds later he had his answer: lilac. Then my sister wrote to ask how she could identify the bird building a nest on her deck.