structure of hair up close - part 1

From J, our resident haircare expert (no, that's not a weave. it's real...)...in my most recent reader question, i mention the use of protein to assist in repairing heat damage. in my talks with leila, i have begun to realize that some of the terminology i frequently use like "cuticle" and "hair shaft" may be foreign to some, especially newbies. sometimes you just gotta go back to basics! i