They're inspiring, fun, and harder to find than a 50-year-old at a Justin Bieber show: Cool teachers.

You know the kind: they actually seem to enjoy what they're teaching. They cut you a break on the grades when they know you're trying hard. They're able to laugh at themselves - and make you laugh. I had a few of these in my high school days, and I'll never forget 'em.

Take a look at the math teacher in this vid. You'll wish you had him teaching you fractions!

Math Class Shadow: Cool Teachers Rock

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- Doug