This is the book I've been waiting for all my knitting life! I am only into Cotton, but already I am looking at my yarn with completely different eyes. I looked and actually saw ... a crimp! Yes, a crimp. I had never heard of this word associated with yarn, but it looks just like a crimped human hair! I feel so knowledgeable. I want to pick up yarn and feel it; examine it; pull tiny strands; I want to do everything she says! You'll be hooked also. This is a reference book you will never want to lose. Thumbs up, Clara!