| 
	  
       | 
    
    
      
        
          
      February 2009  - Success!  For testing of hydrogen isotopes, the feather sample must weigh between 0.33 and 0.37 mg ... getting the measurement within that very narrow window was a challenge, but did get somewhat easier with practice.  (Photo by Marcel Gahbauer) 
      
      
       
     |