Two self-driving racecars put the pedal to the metal this weekend in Buenos Aires. The prototype racers put in 20 laps, each topping 115 miles per hour at the Puerto Madero street circuit before one of their days came to an abrupt end. We’ve been stoked about Roborace since Formula E first made the announcement over a year ago. Unlike Formula E — an electronic vehicle racing circuit — Roborace vehicles have no driver. Instead, engineers focus on who can build the best AI. In Roborace’s case, “best” means the one capable of piloting a car around a track faster than nine other…

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