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To escape Washington's summer's swelter, I've flown to Argentina and discovered that there's one big surprise among the many things that set this part of the world apart at the moment.

Yes, the steaks are great, the tangos catchy, and the weather here in Buenos Aires cool in July. But who'd have expected that the Coca-Cola logos would often be green?

I used to collect Coke memorabilia, and red is what I've always associated with Coke — a specific, blazing, eye-catching shade of red, in fact. The company does have a rainbow's worth of product packaging these days: blue and green for Sprite; silver and gold for caffeinated and non-caffeinated Diet Coke; black for Coke Zero.