From 1755, British authorities deported thousands of French-speaking Acadians from what is now Nova Scotia, an event known as the Great Upheaval, or 'Grand Dérangement'. Many eventually settled in Louisiana, then under Spanish rule. Pronounced 'Cadien' in their own speech, the name became 'Cajun' in English mouths. Their food and music made the word famous, and Cajun French is still spoken in Louisiana.
In Kuşköy, a mountain village in northern Turkey, people talk across valleys by whistling Turkish. A 2015 study showed that whistled Turkish draws on both hemispheres fairly evenly, whereas spoken Turkish relies mostly on the left. The physical form of the signal, it turns out, matters to the brain.
Speech has no gaps between words. In 1996, researchers played 8-month-old babies a continuous stream of made-up syllables for just two minutes. The infants picked out the 'words' by tracking which syllables tend to follow one another. That's probability calculation, done without a calculator or any visible effort.