From: nospam@nospam.com   
      
   I read a news item about the original air processing machine on the   
   ISS having been broken for some time, and the astronauts depending   
   on the older "oxygen candles".  Did the origninal machine produce   
   Oxygen by cracking Carbon Dioxide?  If so, what was the chemical   
   (electrochemical?) process involved?   
      
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