This desire to preserve capital in the most liquid market around had a double whammy effect on commodities.

FORBES: 2012 Outlook: Economic Slowdown Could Pinch Demand For Some Commodities

Other complaints include that the series of downgrades spreads fear of a domino effect across Europe that could cause a double-dip in EU economies.

FORBES: Rating Agencies: Damned If They Downgrade, Damned If They Don't

The heavier weight on STEM helps minimize the effect of a double-counted STEM worker in a tech company.

FORBES: Methodology For Forbes' Best Cities For Tech Jobs List

The double recession and mortgage crisis has had a big effect on life in Madrid.

BBC: Living in: Madrid

While too much sodium is associated with cardiovascular problems, too little potassium can have the same effect, so potassium chloride has a double benefit.

FORBES: Salt: A Favorite Ingredient Gets A Molecular Makeover

Important obstacles for Citi include political action, with Dodd-Frank, Basel III, and other regulation beginning to take effect, and a weaker than expected, double-dipping housing market.

FORBES: Bullish On Citi As Retail Investors Abandon Ship

But despite the side effect, patients with severe MS wanted Tysabri, and sales were growing at a double-digit clip.

FORBES: Biotech's Comeback Kid

"He has a Marmite effect, you either love him or you hate him, " says Dr Oliver Double, who lectures in stand-up comedy at Kent University and is a former circuit comedian.

BBC: Russell Brand

Given the currently very low short term interest rates (and assuming that the effect would be the same) that would mean that a default on Aug 2 could double short term interest rates.

FORBES: The Last Time the United States Defaulted on Treasuries