Finland working to expand early education

Michael Alison Chandler:

Finland often ranks among the highest-performing countries on international math and reading tests. The Nordic nation gets results despite one surprising fact — compulsory schooling does not start until age 7.
 
 As the United States pushes to improve its competitiveness through greater access to early education, with programs in the District and elsewhere that provide universal preschool to children as young as 3, this seems surprising. How do they do it?