It began with the Grove Body Part Chart...Sari Grove's theory that each body part contained two opposing elements that must live in balance for health...Book 1 explained the Chart & what the elements were( from the Periodic Table), & where to find them in real life...7 books later we had a series- The Grove Health Science series of books, each building on the one before...Book 5 looks at the brain parts, & indeed a Brain Part Chart has evolved that syncs up with the body parts...Book 8 takes a look at how to get rid of a breast cancer lump, plus it contains a short tutorial on the Chart in case you were skimming along...