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MADE IN THE USA - Could crucial parts of the equipment Iran is using in its uranium enrichment facility have come from the U.S.? American law enforcement authorities say sensitive devices and electronics that could be used in weapons of mass destruction are being smuggled into Iran. Lesley Stahl reports . Shachar Bar-On and Meghan Frank are the producers. DAVOS- Nowhere in the world can such a concentration of power be found than at the World Economic Forum's meeting in Davos, Switzerland, where the world's most powerful and influential people gather yearly to try to solve the world's most pressing problems. Scott Pelley reports . Michael Karzis is the producer. PIGEON FEVER - It's been just over a year since Bernard Madoff's multi-billion dollar Ponzi scheme fell apart. But, as Morley Safer reports, despite all the news about the Madoff scandal, similar Ponzi scams are still thriving. David Browning and Diane Beasley are the producers.