Head Start in Karts

On the grid, minutes before the start of a British Grand Prix in August, the drivers' faces are grim with concentration. The pre-race interviews are over, and the glamour models in hotpants are tottering off the circuit. Fans are screaming from a packed grandstand. Squeezed into his driving seat, wearing a red, white and yellow jumpsuit and white helmet, Trevyn-Jay Nelson is pulling on a pair of tight black gloves. No question where he's expecting to finish: "First," he says before flicking down his gold visor. At the start signal, with a burst of engine noise, the drivers dart down...