This last Saturday, we had the pleasure of celebrating our youngest son's tenth birthday riding roller coasters at Six Flags Great America. Believe or not, I love roller coasters! Normally I am cautious by nature but there is something about strapping into a twisting hulk of fast moving metal that excites me. One of my sons, who not only matches but can exceed my tentative personality, feels less than enthusiastic about roller coasters. The funny thing is, if I can get him to