"Unique" and "data" are used wrong all the time! I firmly believe that using our words carefully and accurately is a central aspect of being a well-intentioned gentleman. Vocabulary ensures that what we say is accurately understood by our audience (online and in person). Vocabulary is also the single strongest predictor of overall intelligence on standardized intelligence tests (this was my field of research for about a decade). In order to avoid this coming across as elitist, I want to stress that my emphasize that the two guidances below - certainly pet peeves of mine - are words we use every day rather than something only used in rarified academia or by some PhD on a sartorial forum... 🤓 Unique: its simple definition is "one of a kind". This is dichotomous, like a light is on or off. No in between. Therefore, nothing can be "really unique", or "largely unique" or nearly any other modifier applied to it. When something is not one of a kind, we still like "unique" because it sounds stronger than what we should probably say: very rare. It is, however, wrong and inaccurately conveys our intent. The only appropriate modifier for unique is something which clarifies the noun is becoming unique. If only three of something remain in the world and one is destroyed, saying the final two are "nearly unique" is appropriate. Data: this word is ALWAYS a plural. Datum is the word to describe a single piece of data. This is just like saying "this people is funny" when we mean "this person is funny". As a statistician, you can only begin to imagine how much this drives me nuts because of its near omnipresent use. "These data are impressive" may sound weird at first, but it is the only grammatically appropriate way to say it. I hope this was helpful and not pedantic!