They say they can keep rain from falling on the Bird's Nest Stadium during the opening ceremony - the stadium has no roof - but scientists elsewhere are dubious about that kind of technology.

NPR: Beijing Preps For Opening Of Olympics

But those trying to show stronger gains than competitors say they must either keep buying stocks or risk falling behind.

WSJ: S&P Record Is a Show of Faith in Fed

They will now be as keen to keep them from falling too far.

ECONOMIST: Debt and deflation