https://www.nlm.nih.gov/exhibition/emotions/balance.html www.nlm.nih.gov/exhibition/emotions/balance.html. https://www.nlm.nih.gov/exhibition/emotions/balance.html NLM https://www.nlm.nih.gov/exhibition/emotions/balance.html NLM https://www.nlm.nih.gov/exhibition/emotions/balance.html