 With more practical tips and useful advice, this is the Old Farmers' Almanac Radio Report for Tuesday, July 2nd, the 184th day of the year. Comedian Larry David has a birthday, and the first Walmart store opened in Arkansas on this day in 1962. There's an old adage that says thunderstorms can cause milk to go sour. Implausible folklore? We've heard enough accounts from dairy farmers to believe something is going on. But the connection has never been scientifically proven. Experiments that have run electricity through milk have found no effect.