Lewis Hamilton made a huge team-switch announcement before the Formula 1 season started.Edmund So/Eurasia Sport Images/Getty ImagesThis article is part of "Behind the Wheel," a series about the highly competitive and high-tech world of Formula 1.It's been an eventful year for Formula 1.In addition to the drama that unfolds outside the track, F1 fans have been treated to competitive races and a legitimate battle for the drivers and constructors championships.The season is entering the home stretch — this weekend's US Grand Prix kicks off the final six races of the year.