Varying moods and energy levels have been a part of the human experience since time immemorial. The words “melancholia” (an old word for depression) and “mania” have their etymologies in Ancient Greek. The word melancholia is derived from melas/μελας, meaning “black”, and chole/χολη, meaning “bile” or “gall”, indicative of the term’s origins in pre-Hippocratic humoral [...]