There’s a bizarre-seeming paradox sitting at the heart of research into early childhood education. On the one hand, there’s a sizable body of research suggesting that kids who go through intensive education at the ages of 3 and 4 don’t really come out ahead in terms of academic abilities. By kindergarten much of their advantage has receded, and by second grade researchers typically can’t detect it at all.
On the other hand, there’s an equally substantive body of research suggesting that early childhood education produces a profound, lifelong advantage. Kids who enter intensive preschool programs are less likely to be arrested, more likely to graduate, and less likely to struggle with substance abuse as adults. One study with a followup when the students were in their mid-30s found that they were likelier to have eventually attended and completed college.
This is an area where research is fiercely debated — and really important. In 2017, the US spent $9 billion on Head Start, the flagship early childhood education program launched in the 1970s. If one set of studies is wrong, that has profound implications for how we should be spending that money instead.