For a long time, philosophers and scientists assumed that we humans have a limited set of basic emotions – such as fear, joy, anger – that can explain the range of feelings we experience. A more recent theory takes a different approach: We have infinite emotions, so long as we can name them. This makes for interesting neologisms and is at the heart of the internet trope «tfw», with people describing in specific terms «that feeling when…». It has more serious implications, too: New ways of defining emotions «shift the way neuroscientists search for treatments for emotional problems», like depression or anxiety. An eye-opening read.