Someone once quipped that the best way to double your money is to fold it in half. That's amusing, but it's not going to help you build a nest egg for retirement. Since few of us are financially independent, most of us need to be saving and investing for our future financial security.

If you have $10,000 socked away, you'll want to double it to $20,000, and then double it again, to $40,000, and again and again, to $80,000, $160,000, $320,000, $640,000, and perhaps beyond. Here's how you might go about doubling your money.

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Source Fool.com