As readers of this blog know, I am agnostic about the Common Core standards, because they have never been tried anywhere.

We don’t know whether they will improve academic learning, whether they will increase the achievement gap, whether they will make any difference.

Recently the renowned scholar faced off with New York Commissioner of Education John King.

Commissioner King comes out of the charter sector and has very limited experience as a teacher or an administrator.

He believes passionately in the Common Core. So do Arne Duncan, Bill Gates and Tom Friedman.

Yong Zhao patiently explained to Commissioner King that there is no evidence for the efficacy of the Common Core.

And none for its lack of efficacy.

There is no evidence.