<p>"PASADENA, Calif.--Fifteen years ago, Corinna Zygourakis decided at the tender age of seven that she wanted to be a brain surgeon. Now that she's graduating from the California Institute of Technology and heading for the Health Sciences and Technology (HST) M.D. program of the Harvard Medical School, she still intends to devote her career to the grey matter, although she's not quite sure yet whether she'll go into surgery...."</p>