Guaiac-based fecal occult blood test (gFOBT) One way to test for colorectal cancer is to look for occult (hidden) blood in stool. The idea behind this test is that blood vessels in larger colorectal polyps or cancers are often fragile and easily damaged by the passage of stool.
How far to book in advance: Seven weeks for domestic flights. Book 11 to 12 weeks out for international flights. The worst day to buy: Within 11 days of your flight. One day before the flight was the absolute worst. The best fares for Thanksgiving: For Thanksgiving 2012, the best day to buy was, on average, 96 days (about 14 weeks) before the flight. The bottom line: Do your homework before booking any flight, and make sure you've got the right tools to set yourself up for the best fares.
Best Days to Buy Airfare. 3. One day stands alone as the best day to shop. If you've been reading my column for any length of time, you probably already know the answer to this, but if not, I won't keep you dangling: the best day to shop for airfare is Tuesday.