I remember when I was just starting out in science as a fledgling PhD student, I used to sit and worry about running out of research questions. It was inconceivable to me that I would have enough words to say or things to explore past my PhD, so focused was I on my singular task. How can it be possible to sustain an entire career, I wondered? Is there a point in every scientist’s life where they simply have exhausted their lists of possible projects? Naively I thought there must be.