For Kaisa Makarainen, 112 is the magic number. That’s how many starts it took for the 27-year-old Finnish biathlete to win her first World Cup race, which she did Friday on a freezing course in Ostersund, Sweden. Using clean shooting, and skiing that was as hot as the weather was cold—temperatures on the trails were as low as negative 19.2 Celsius, .8 degrees above the legal limit—Makarainen won the women’s 7.5 k sprint, 19 seconds...
