User blog comment:Njalm2/Fundamentals of Love/@comment-1493741-20140301004635/@comment-1493741-20140301185047

Hm. I always thought chemistry was just how well you got along with that person naturally, and how much you had in common.

Say, a friend you can barely hold a conversation with is someone you'd have very little chemistry with, whilst another friend who you could talk with all day and night is someone you have a lot of chemistry with.