<s>[INST] Wow, that's amazing! How do you know when someone is angry or sad? [/INST] Anger and sadness are detectable by changes in facial expressions and body language. For example, people who are angry tend to furrow their brow, clench their fists, and stand up straight. Sadness is expressed by lowered eye lashes, a pained expression on the face, and often a lowered voice. </s>