“Brancusi practiced what I call The Vampire Test. It’s a simple way to know who you should let in and out of your life. If, after hanging out with someone you feel worn out and depleted, that person is a vampire. If, after hanging out with someone you still feel full of energy, that person is not a vampire. Of course, The Vampire Test works on many things in our lives, not just people—you can apply it to jobs, hobbies, places, etc.”