Fixing warped boards

BookThink's editor Craig Stark frequently publishes useful Bookthinker articles on a variety of subjects of interest to collectors. A new piece, free to readers (you don't have to be a Gold subscriber), is an excellent primer on the causes and fixes of warped boards. I'm sure everyone's come across this problem at one time or another, especially maddening when not disclosed by the seller, and wondered what fix is most effective and safe. Check it out here.