https://scottaaronson.blog/?p=6457
I also had the following exchange at my birthday dinner:
Physicist: So I don’t get this, Scott. Are you a physicist who studied computer science, or a computer scientist who studied physics?
Me: I’m a computer scientist who studied computer science.
Physicist: But then you…
Me: Yeah, at some point I learned what a boson was, in order to invent BosonSampling.
Physicist: And your courses in physics…
Me: They ended at thermodynamics. I couldn’t handle PDEs.
Physicist: What are the units of h-bar?
Me: Uhh, well, it’s a conversion factor between energy and time. (*)
Physicist: Good. What’s the radius of the hydrogen atom?
Me: Uhh … not sure … maybe something like 10-15 meters?
Physicist: OK fine, he’s not one of us.