Can you read a Telltale?

Telltales, tufts, wind indicators, flappers, or woolies - no matter what you call them are an invaluable aid in sterring and trimming a sailboat. BUT - do you know how to read them? We came across a great article that clearly explains the theory behind telltales and how to read them. If you feel a little fuzy on the subject and want to learn more, it is well worth the effort to read this article...