Each year, 2.5 million children in the U.S. go to sleep without a home.
The Boston Celtics took a break from practice to play with the kids from Horizons for Homeless Children.
Center Kelly Olynyk supervised the slide area while rookie point guard Marcus Smart blocked some kids' shots.
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The Massachusetts non-profit offers early education, family support services and opportunities for play.
But they need your help. You can help a homeless child get school ready. Donate now at horizonschildren.org.