Insight from Neil deGrasse Tyson about how impor­tant it is to be sensi­tive to someone’s current state of mind when you are trying to teach or persuade. You don’t teach with facts alone. You have to under­stand how those facts/thoughts are received by the person on the other end. And to do that, you have to under­stand what’s already in their head and how those ideas got there. Teaching is about bringing facts and external sensi­tivity together to have impact.