It's not easy for a teenager to be different, let alone stand up in front of a class at school to talk about it.

But two Palo Alto eighth-graders -- who live with the disruptive, involuntary motor and vocal tics caused by Tourette Syndrome -- have learned to do just that.

Since being diagnosed with Tourette in elementary school, Peter Lenicheck and Mark Smeets each have tried many times, with varying degrees of success, to explain their unusual behavior to classmates.

Recently, their parents took them to Washington, D.C., to be trained by the national Tourette Syndrome Association as official "ambassadors" for explaining the neurological condition.

Mark and Peter are scrapping their homemade presentations for official handouts from the association, but their task of explaining hasn't really changed.

"It's not one of the disabilities everyone knows about," said Mark, a student at Jordan Middle School.

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