It all starts with Persian 'dīwān', a register, then the office where it was kept. Through Arabic, the word reached Italian as 'doana', the tax office, which gave French 'douane', customs. Through Turkish, it named the Ottoman sultan's council, then the long cushioned bench lining the council chamber: the divan. From tax collectors to the sofa, one single word.
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.