This year alone, over 129,000 people will be diagnosed with colon cancer — a disease that is 90 percent curable — if caught early. The trick is to get tested. On NBC’s “Today” show, in part two of a week-long series, “Confronting Colon Cancer,” the show takes a look at having a colonoscopy — considered the most effective test for colon cancer. In this case, it’s Katie Couric’s colon that’s going to be tested. The story begins the night before, as Katie prepares for her first colonoscopy. Watch this special report from Katie Couric.