I was 2 months into my first job in the US when I worked out that my manager used "How are you?" as a greeting, no different from "Hello". No answer was actuall

I was 2 months into my first job in the US when I worked out that my manager used "How are you?" as a greeting, no different from "Hello". No answer was actually expected. It felt odd not to answer a question asked of me, but I'm used to it now.