What do we do?
Yesterday, as I was waiting for the rain to stop before I could walk home from work, a stranger accosted me in the lobby of the building. He asked me what I did, to which I replied "Mechanics". He mulled over the answer for a bit and asked me to be more specific, at which point I said that we were trying to design materials that could guide waves around objects. He said "Water waves?". I replied "All types of waves." Clearly, common words can mean quite different things to different people.