sentences:  In English a short sketch of the hypothesis first appeared in "The Early History of Indo-European Languages", published in "Scientific American" in 1990.Tamas Gamkrelidze published an update to the hypothesis in 2010.According to Gamkrelidze and Ivanov, the Indo-European languages derive from a language originally spoken in the wide area of eastern Anatolia, the southern Caucasus, and northern Mesopotamia.