July 4th. Time for family, food, fireworks…and marathons! While most of us will spend time outside at the pool or in the backyard, you have to cool off sometime — and our networks have just what you need. Check out the schedule below and, most of all, have a happy and safe holiday weekend! Saturday, July 2 Discovery Channel’s Swamp Loggers: 9am – 12am ET/PT TLC’s My Big Fat Gypsy…