It is one of the most beautiful aspects of our northern climate - the changing colours of fall foliage make for dazzling displays all across Ontario. But while most of us concentrate on where to to look at leaves Libby Znaimer asked Dr. Marc Cadotte, of the Department of Biological Sciences at University of Toronto-Scarborough, why their colours change.

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It’s something we should do every day, not just on Thanksgiving. There’s a school of thought which holds that practising gratitude can make us happier. Libby talked with psychologist Dr. Sam Klarridge.