Source: https://www.amazon.com/Love-2-0-Finding-Happiness-Connection-ebook/dp/B008BM0LMG/ref=as_li_ss_tl?ie=UTF8&qid=1481184788&sr=8-1&keywords=Love+2.0:+How+Our+Supreme+Emotion+Affects+Everything+We+Feel,+Think,+Do+and+Become&linkCode=sl1&tag=crimrepo-20&linkId=cfa6bac4bda3b66352fa3c9d0f657ea3