Thirty-two-year-old John Wood is a surgeon at a famous Boston hospital. "During the first two years of high school,I found biology very difficult. My report cards always said things like 'must try harder' or 'John ought to choose non-science classes.' This was a disaster for someone who had always dreamed of becoming a doctor. I was so discouraged that I dropped out of high school at 16 and started working at a local supermarket.