The following papaer shows bread as early as 30,000 years ago. This approach conducted starch residue analysis of stone tools.
Revedin, A., Aranguren, B., Becattini, R., Longo, L., Marconi, E., Lippi, M. M., Skakun, N., Sinitsyn, A., Spiridonova, E. & Ji ři Svoboda. 2010. Thirty thousand-year-old evidence of plant food processing. Proceedings of the National Academy of Science (PNAS), www.pnas.org/cgi/doi/10.1073/pnas.1006993107.
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