> Second, if I understand their methodology, they are checking students with no enrichment activities to children with a few minutes a week of enrichment time.

> Second, if I understand their methodology, they are checking students with no enrichment activities to children with a few minutes a week of enrichment time. Did you read the paper? That’s not what they say at all. In fact they say that we would expect no real difference from a few minutes and 0 but because we do find differences we can use that to control for other factors.