evolution of language
The Whorf hypothesis says language shapes human thought. A small indigenous group with few number words puts the idea to the test.
An analysis of the internal bone distribution of the Kebara 2 hyoid bone shows a pattern of forces similar to speakers of modern languages.
A study of sequence variation shows a possible selected change among living people, but many still have a form shared with Neandertals and Denisovans.
A critical look at the point of view that human language did not originate from its adaptive role in communication, but from other cognitive functions.