Just had the coolest math conversation with Robin. TMBG taught him the joy of a basic addition game with us: What’s tuba plus tuba? What’s fourba plus fourba? Today he took it further. He asked me what 8+8 was. Then 8+9. Then 9+9. Then he asked me what made 19. I said 10+9. He asked me what made 100? I said 80+20. He said, “Also, 90+10.” Then he said, “Does 90+1 make 100?” Wrong, but an interesting insight into how he’s thinking about numbers.