Harvey Milk's Career Was Built on Dog Poop

As a former leader of the youth movement that overthrew Slobodan Miloševic—and now as somebody who shares his passion about non-violent struggle with everyone from street activists in the Middle East to students at Harvard and NYU—there's one thing I've learned: A big part of a movement's success will be determined by the battles it chooses to fight, and a lot of that has to do with how well it understands its opponent. Many centuries ago, Sun Tzu reflected on this idea when he told readers of The Art of War how important it is to always put your strong points against your enemy's weak points. Take Gandhi, who went up against the British army, the most powerful in the world, by attracting 10,000 Indians to march for tax-free salt—a mineral essential for human survival and found in almost every household, no matter how poor.