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- 2022-6-4
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P1: ancient signal in language is surprising: words change, cannot be traced. However we can trace back to 9000 years at most
P2: Dr A apply stat methods constructing genetic trees. Suspicious, however can accept because it does not conflict with current scholarship.
P3: Looking not at words but at phonemes. Dr A found pattern in 500 languages: a language use fewer phonemes the farther that early human had to travel to reach it. 遥远的夏威夷只有13,非洲有more than 100
P4: pattern decreasing diversity with distance, similar to genetic diversity with distance from africa, imply origin of modern language in sw africa
P5: A's study was prompted by finding that number of phonemes increase with number of people who speak it.
P6: human expansion and language develop; smaller group move and reduction in its genetic diversity
P7: either reduction in diversity, population budding rapid and diversity build again. Human expansion out of africa is rapid.
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