Avalanche | Enhancing the Bike

Avalanche: It took 10 hours for rescue crews to reach Hotel Rigopiano after an avalanche buried the Italian resort. No one expected survivors, but rescuers never gave up on those who'd been buried alive.

Enhancing the Bike: Bill Whitaker investigates whether pro cyclists have used secret bike motors to win races -- like the Tour de France -- in a sport notorious for its culture of cheating.

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