Five things to know about what's going on at Daytona International Speedway in advance of Sunday's season-opening Daytona 500: --- RAIN, RAIN: Intermittent showers soaked Daytona International Speedway on Friday and washed out the second of two practices for the Daytona 500. Martin Truex Jr.'s crew failed to get his No. 78 Chevrolet on track for the first practice Friday. More...