This has fascinating implications for pedagogy. It also reveals interesting bias about learning theory.

Is Google Wrecking Our Memory? 

No, the truth is much weirder than that.

Consider that for a young child in the daily company of teachers, making an effort to retain the lessons is sort of an unnatural thing to do. Because the kids know the teacher already knows the answers. The human brain is pre-wired to skim information already retained in the community.