Carl Wienman won the Nobel Prize for physics, and is also outspoken in his support of cooperative group learning in the college classroom. Many of those same ideas can be applied to the K-12 school, and to other subjects, too.
Here are some other links and videos on his work. I’ll be adding this post to The Best Sites For Cooperative Learning Ideas:
A Better Way to Teach? is from Science Magazine.
Here’s a video report on his research:
Here’s a video he created: