1. One of my first mentors had a huge lab (like, over 40 people). He made *everybody* learn each others' names. We had to submit our names and photos for online flashcards. There was a lab meeting where we literally spent most of the time going around and naming everybody in the room.
"If you continue in science, there's a good chance you'll interact with one of these people again. And when you do, you'll want them to know your name."