Got a song stuck in your head? Catchy songs have been around as long as there's been music , but what makes a song stick in our minds is still a mystery.

I recently chaperoned the all-night graduation party at my daughter's high school. After hanging out at an all-games-and-rides-free arcade until 2 a.m., we took the graduates on chartered buses to a private all-ages nightclub in downtown Seattle. It boasted free unlimited fountain soda and snacks, a photo booth with props, a trivia contest, glow necklaces and, best of all, a dance floor with a DJ spinning tunes until 5 a.m.

I watched with fascination as the crowd on the dance floor ebbed and flowed. These teens had been going, going, going all day, celebrating their graduation in the shadow of the Space Needle, posing for endless pho

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