After sharpening his skills under the legendary currency trader George Soros, the billionaire Stanley Druckenmiller started the Duquesne Capital Management hedge fund in 1986. The fund produced 30% returns annually before he converted it into a family office, a private fund that's much easier to manage.These days, individual investors can't get Druckenmiller to manage their money directly, but there is a way to follow his trades. The Securities and Exchange Commission requires everyone who manages over $100 ...