Ancient DNA shows first farmers in South-East Asia migrated from China 4,500 years ago

Researchers extracted DNA from ancient bones found in modern-day Vietnam, Cambodia, Thailand and Myanmar to estimate when new genes started flowing into the Indigenous hunter-gatherer populations of the time.  They found an influx of genes from South China coincided with the appearance of agriculture in South-East Asia around 4,100 to 4,500 years ago, alongside pottery and tools made in the southern Chinese style.  A second gene "pulse" flowed from China to South-East Asia a couple of thousand years later.