Sport - 8 free documentaries about motorsport & speed.
Start with TRACTOR PULLS: It's Not What You Think - Smarter Every Day 276 (29 min, Smarter Every Day), then How F1 Exploded (21 min, Wendover Productions). All 8 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on motorsport & speed is Go Like Hell by A. J. Baime.