After studying four decades of terrorism, Aaron Clauset thinks he's found mathematical patterns that can help governments prevent and prepare for major terror attacks. The U.S. government seems to agree.
Patagonia, Honest Tea, The Timberland Company and Seventh Generation Inc. talk the talk of corporate social responsibility and appear to walk the walk.
Gary Cohen and his nonprofit, Health Care Without Harm, have persuaded hospitals around the world to close their medical-waste incinerators, dramatically cutting emissions of dioxin and other toxins.