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.
Book further out around the holidays. The same CheapAir.com study from last year showed that the optimum booking time was slightly earlier for peak travel times. For example, the cheapest flights around Thanksgiving were booked 96 days, or 14 weeks, in advance. Fly on Tuesday, Wednesday or Saturday. According to FareCompare.com, the cheapest days to fly in the U.S. are the days less popular with consumers.