Pick Pockets

A new book, The Bay Area Forager , argues that foraging not only helps keep unwanted food from going to waste but can also fight the spread of invasive plants and promote sustainability. So go ahead: Grab an apple. Organize a neighborhood harvesting party. Cook some acorn pâté. Just make sure that you get the property owners' permission first and that you're not about to ingest something harmful. Across the U.S., mobile apps and other technologies are helping wild foodies get their fill. Here's a look at how a handful of cities are responding to the rise of urban foraging. If you...