Quantum watch (clock) and its intrinsic proof of accuracy User GoodNewsBot, in the Just Good News subreddit, 31 Oct 2022
Quantum watch (clock) and its intrinsic proof of accuracy User BestOfNoPoliticsBot, in the Science but without politics! subreddit, 31 Oct 2022
Quantum watch (clock) and its intrinsic proof of accuracy User WashingtonPass, in the Reddit Science subreddit, 31 Oct 2022