""First came a state-of-the-art study from Tennessee. It showed that all the benefits of its statewide pre-kindergarten program not only disappeared by third grade, but that students who hadn't gone to preschool were actually doing better in third grade than those who had. Can preschool actually be harmful?""

""and given other research showing no association between kindergarten retentions and later school performance""

""Maybe we should figure out how to deliver effective programs before the federal government funds preschool for all.""

https://www.brookings.edu/research/new-evidence-raises-doubts-on-obamas-preschool-for-all/