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The Financial Times has a cool Olympic feature, where they run a formula for how many medals countries should get -- based on things like historical performance, per capita GDP, and host-country advantage. Then they compare that against actual performance in the Games.
Over the weekend, Usain Bolt of Jamaica won the 100 m running race at the Olympic games. Jamaica and other island nations have become know for their sprinting power, in the same way that countries like Kenya are known for their strength in distance running.