What is the difference between "go in to work" and "go to work"?
Initially, I stumbled on go in to work watching Big Bang Theory movie series, an episode where Sheldon got fired, and Penny asked him
How come you didn't go in to work today?
But after I try to google it I found that both expressions seem to be quite common though scrutinizing of those google hits doesn't help me to understand a difference in using. Meanings of both seem to be the same to me.