"The most powerful pirate in history was a woman who was born into poverty in Guangzhou, China, in the late 1700s. When pirates attacked her town and the captain took a liking to her, she saw a way out. Zheng Yi Sao agreed to marry him only if she got an equal share of his business. When her husband died six years later, she took command of the fleet. Over the next decade, the pirate queen built a fleet of over 1,800 ships and 70,000 men. On land...