The first punctuation mark was a triangular symbol pressed into clay somewhere in Mesopotamia. Spaces between words were unknown for millennia, until a group of Irish monks pioneered them in the eighth century. Flash forward 1200 years, and in 1905, Moscow's typesetters went on strike because a new regulation said they would be paid by alphabetical letter only, excluding commas, full stops, and the spaces between words. Half the work of setting a page is punctuation. The printers refused. Within weeks, the strike had spread to lawyers, teachers, railway workers, and bakers, and the czar was forced to concede a constitution. Leon Trotsky later said: "A strike which started over punctuation marks ended by felling absolutism." Twelve years later, that constitution was swept away by the revolution the printers had set in motion.

Today's guest is Florence Hazrat, author of On the Mark: From Periods to Interrobangs, How Punctuation Remade the World. We discuss how the first punctuation in human history was a wedge pressed into wet Mesopotamian clay 5,000 years ago alongside the invention of writing itself, why the Romans deliberately refused to use punctuation because interpreting unpunctuated text was a privilege reserved for the elite, and how a misplaced pause in the Gospel of John could deny Christ's divinity, which is why early Christians became obsessed with dots. We look at how Irish monks in the eighth century invented spaces between words and may have changed the course of civilization, and that punctuation has never been neutral: it has hoarded power for elites, preserved orthodoxy for the Church, triggered revolutions, determined whether men lived or died, and is now evolving again as screens replace paper and AI generates text without human hands.

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