Finland figured out the secrets to designing perfect schools - and the US can never replicate them

Finland's repeated success in national education rankings means there are at least a few lessons the US can learn.

But one that it can't replicate - due to old-school mindsets about what education is supposed to look like - is how Finland designs its schools.

Finnish schools are increasingly adopting the mindset that flexible, open learning spaces are better than walled-off classrooms, and that mixing students of different ages is better than drawing bright lines between grades.

Here's what it's all about.