This is the time of year when you should be thinking about giving something extra to those special people in your life -- including your hair stylist, baby sitters and newspaper carriers.

The world of tipping can be a puzzling place, but thank goodness somebody has made it his business to become an expert.

Check out this video for tips from the author of "Keep the Change: A Clueless Tipper's Quest to Become the Guru of the Gratuity."