Betting against markets can be profitable.
News & Analysis: UltraShort Euro
Sovereign debt woes may make Europe look like a great short, but don't bet the farm on it.
Recent events abroad put these ETF in focus this week.
Take some chances with part of your portfolio and you'll learn a lot more about investing.
Playing the forex markets is dangerous, but you need to understand how they affect stocks.
Fool U.K.'s David Kuo talks Greece with Tim Hanson.