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I’ve also heard of the ‘melt’ between freshman and sophomore year. Kids who had an okay but not great first year, plan to go back, but once they are home for the summer realize they don’t like their college so much after all and don’t return
“Hidden Brain” - a podcast for NPR also did an episode about this :
http://www.npr.org/2017/07/17/537740926/why-arent-students-showing-up-for-college