IRenderable: yes, but high school interns seem to be rarer. The Internet Explorer team had a high school intern this year, for instance, but he was a guy who made a name for himself finding security exploits in IE.
My good friend Mark Hammond was an Intern in high school and college (he was local to Seattle, and went to Caltech) and worked on IE 3,4,5 & 6.
He's now up in Boston doing an NLP startup, he just recently quit MSFT b/c his wife is getting a PhD up at Yale.
He's someone I'll introduce you too later, Robert -- he's sure to keep making waves (he's about 26 now).