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"When Did Humans Learn to Boil?" 2014 paper by anthropologist Dr. John Speth: https://paleoanthro.org/media/journal...

2011 study the found a grain of boiled barley on a neanderthal's tooth: https://www.pnas.org/content/108/2/486

2012 study that showed limestone pot boilers can nixtamalize corn: https://core.ac.uk/download/pdf/19150...

2012 study finding 20,000-year-old pottery in China: https://science.sciencemag.org/conten...