Earlier this year, quantum physicists succeeded in un-ageing a single, simulated particle, essentially moving it backward through time for one millionth of a second. The feat required so much manipulation and was considered so impossible for nature to replicate that scientists present it as reinforcement of the irreversibility of time. But what if the reversal of a single moment in time was possible? Write a personal essay that reflects on one moment in your life that you would do over, if you could. What actually happened, and what do you perceive as the long-term consequences if things changed?