Chicago-based radio program "This American Life" cracked the Coca-Cola code. The show apparently unearthed the soft drink's recipe -- which is guarded in a massive vault in the Coke's corporate headquarters in Georgia -- in a 1979 edition of the Atlanta Constitution-Journal. The recipe dates back to 1886.
So what's in it, then? To start: the eponymous coca extract, plus citric acid, lime juice vanilla, caramel, caffeine, sugar and water. More important, though is "7X" -- which includes orange oil, alcohol, nutmeg oil, lemon oil, coriander, neroli and cinnamon -- and constitutes the drink's backbone.
You can read more about the recipe and listen to This American Life's broadcast at their website here.