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I responded to a comment about wait-time and access to interactives, but  
didn't quite get it right.  Peter Anderson is right: the idea is to have  every 
experience available after 90 seconds (so have two copies a 3-minute  exhibit, 
etc, as Peter points out).  I said exhibits should provide  experiences long 
enough to encourage some thinking, so I guess I should have  thought at least 
90 seconds about my response.  
 
Bob 
 
Robert L.  Russell, Ph.D.

Principal, Learning Experience  Design
[log in to unmask]
(202) 997-5539

Science Advisor, Celebra la  Ciencia 
Self-Reliance  Foundation
www.celebralaciencia.org

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