In this Jan. 18, 2013 photo, Chanhassen High School students relax during a 20-minute "recess" in the commons area during a stress break Jan. 18, 2013 in Chanhassen, Minn. Chanhassen i

 

              In this Jan. 18, 2013 photo, Chanhassen High School students relax during a 20-minute "recess" in the commons area during a stress break Jan. 18, 2013 in Chanhassen, Minn.  Chanhassen i
In this Jan. 18, 2013 photo, Chanhassen High School students relax during a 20-minute "recess" in the commons area during a stress break Jan. 18, 2013 in Chanhassen, Minn. Chanhassen is among a small but growing number of schools that has homework-free nights scattered throughout the school year along with the "recess" breaks two days a week where students chat, catch up on homework, rest, play games like hackie sack or grab a snack. (AP Photo/Jim Mone)