The symptoms of a concussion can be tough for kids to recognize..

Dr. Mike Evans is founder of the Health Design Lab at the Li Ka Shing Knowledge Institute, an Associate Professor of Family Medicine and Public Health at the University of Toronto, and a staff physician at St. Michael's Hospital.

Conceived, written, and presented by Dr. Mike Evans

Illustrated by Liisa Sorsa

Produced, directed, and filmed by Nick De Pencier

Picture and sound edit by David Schmidt

Gaffer, Martin Wojtunik

Whiteboard construction by James Vanderkleyn

Production assistant, Chris Niesing

©2011 Michael Evans and Mercury Films Inc.