If there's anyone out there who, like I did, wants to own a hard copy of Stewart Coffin's book _The Puzzling World of Polyhedral Dissections_ (available free on line), permit me to point out that abebooks.com has just listed a copy for the unusually low price of $27.50. http://www.abebooks.com/servlet/SearchResults?tn=The+Puzzling+World+of+Polyh... --Michael Kleber -- It is very dark and after 2000. If you continue you are likely to be eaten by a bleen.