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An important question in historical linguistics is whether deep genetic relationships exist across language families. Although specific families can be reconstructed back to around 6,000 y ago, Pagel et al. (1) claim that seven Eurasian families arose from a common ancestor 15,000 y ago. Pagel et al. develop a phylogenetic model, starting with a subset of the Swadesh basic word list for seven language families in the Languages of the World Etymological Database, which lists reconstructed proto-words and cognates. Because these reconstructions are potentially unreliable, Pagel et al. treat each reconstructed cognate pair as a binary random variable. They find a robust correlation …

Short, frequent words are more likely to appear genetically related by chance