The most successful version of the most powerful tool humanity has ever created was born in a place where war now rages. That tool is human language, without which we would never have achieved the social organization and transmission of knowledge that have made us masters of the planet. Although the tongue called Proto-Indo-European hasn’t been used in 4,000 years, about half Earth’s inhabitants speak its more than 400 descendant languages: English, the Romance languages of Europe, the Slavic and Baltic languages, the Celtic languages of Wales and Ireland, Armenian, Greek, and languages spoken in India, Pakistan, Afghanistan, and Iran. The explosion of Proto-Indo-European from its origins in Eastern Ukraine—the subject of science journalist Laura Spinney’s beguiling and revelatory new book

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