John Green, the bestselling author of The Fault in Our Stars, returned to his alma mater Kenyon College for the 2016 commencement. He began with a minute of silence — a trick he learned from Fred Rogers — asking everyone to think about the people who loved them into this moment. His thoughts turned to his professor Don Rogan, who had died that year. Rogan was a brilliant teacher, but what Green remembered most was not phenomenology or gospel redaction — it was that Rogan loved him and took him seriously. For years Green wondered why, since he was not a particularly good student. When Rogan died and grief-stricken posts poured in from former students, Green realized: 'He had loved us all.' Love, unlike mass or energy, is not conserved — it multiplies.