Asian stocks tumble on Bear Stearns

• Story Highlights
• NEW: Japan's benchmark 225 index sinks 3.7 percent, HK's down 3.8 percent
  
• Dollar falls to lowest level in 12-1/2 years against yen, to record low against euro
  
• JP Morgan said Sunday it would acquire Bear Stearns for $236.2 million
  
• Buyout fans worries that other big U.S. banks are facing serious troubles
  
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