I can start out with my own profession, education:
1. Piaget's theory of cognitive development.
2. Vygotsky's zones(I'm sorry to say I don't know the english term for his theory, and the norwegian one won't help you).
3. Jerome Bruner showed how language is learned.
4. John Dewey's "learning by doing", and much more.
All four are, among other things, psychologist, and reached their insights through the scientific method, not by looking in old books written a thousand years ago or through "common sense" alone.
And now, with the advent of neuroscience, our knowledge has expanded even further.
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