Thousands of schools have tried the Mix It Up at Lunch Day program since it started 10 years ago in 2001. Teaching Tolerance continues to get glowing reviews from around the country. Teachers and administrators are understandably eager to make their Mix Day better--to reach more students. Here are 10 proven ways to give Mix an extra stir.

In this landmark book, Scott Page redefines the way we understand ourselves in relation to one another. "The Difference" is about how we think in groups--and how our collective wisdom exceeds the sum of its parts. Why can teams of people find better solutions than brilliant individuals working alone? And why are the best group decisions…