Today, we have another installment of our "World's Greatest Investment Ideas" series. This week's interview is on one of the most popular topics in the world right now... gold.

While most stocks and commodities have been crushed over the past few weeks, gold has soared to new all-time highs. Talk of gold in the news and financial media has reached a fever-pitch... But despite the increased attention, gold is still grossly misunderstood by most people.

To learn why gold is so valuable – and why it's so important to own right now – we sat down with Doug Casey, chairman of Casey Research and one of the world's best-known experts on gold and resource investing.

If you still don't own any gold, this week's interview is required reading. And if you have family or friends who think gold is only for "fringe" types, be sure to pass this along.

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