How many hamburgers did he have to sell to buy a set of tires for his go-kart back then? Neel Jani thinks for a minute. Numbers and thought experiments have fascinated him since early childhood. He and his wife, Lauren, are sitting in the Jack & Joey burger restaurant in Mantes-la-Jolie, a good fifty kilometers northwest of Paris. Neel recalls helping out at his parents’ quick-service restaurant at the age of thirteen, before growing up and becoming a race-car driver. The mention of…
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