What Do Finns Do?

I was looking up international test score rankings the other day just for fun, and I noticed something very interesting - Finland is the top-ranked country in all 3 categories tested - literacy, science, and math. Why is this? Again, according to Internet sources, they don't spend the most money or time on education. So what are they doing so differently from what people do here or in the US? I ought to take a trip to go see!