Searching for Health, Kelp vs. Urchins, The Agitators

First, a doctor shares tips for using the Internet to build a healthy life. Also, why spiky purple sea urchins are eating up kelp forests in northern California. Plus, how abandoned suburban buildings and parking lots are being retrofitted to serve the new suburbia. Also on today's show: how three women beat the odds and made their voices effectively heard during the abolitionist movement, and the secret to leaders’ longevity, including Prince Philip and Queen Elizabeth herself.