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. 2019 Feb 20;9:2355. doi: 10.1038/s41598-019-38758-6

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Modern stone tools used for dehusking and grinding foxtail millet, broomcorn millet and green bristlegrass. Scale bar: 5 cm. (a) Stones used for dehusking and grinding Qimengkelake (Xinjiang province). (b) Stones used for dehusking and grinding Gouzhuagu (Hebei province). (c) Stones used for dehusking and grinding Maomaodouzhimaliang (Shanxi province). (d) Stones used for dehusking and grinding Kaoshanmen (Jiangsu province). (e) Stones used for dehusking and grinding Zhushusu (Heilongjiang province). (f) Stones used for dehusking and grinding Mingu (Fujian province). (g) Stones used for dehusking and grinding Yugu (Henan province). (h) Stones used for dehusking and grinding Qutangxiaomi (Guangxi province). (i) Stones used for dehusking and grinding Huangkegouweisu (Hainan province). (j) Stones used for dehusking and grinding Zheng No. 468 (Henan province). (k) Stones used for dehusking and grinding Shaonong No. 11 (Inner Mongolia). (l) Stones used for dehusking and grinding Baigu (Tibet Autonomous Region). (m) Stones used for dehusking and grinding Jishu No. 1 (Hebei province). (n) Stones used for dehusking and grinding JinshuNo. 4 (Shanxi province). (o) Stones used for dehusking and grinding Jinsegouweicao (Beijing city). (p) Stones used for dehusking and grinding Judagouweicao (Hebei province). (q) Stones used for dehusking and grinding Zhouyegouweicao (Zhejiang province). All the images of stone tools were taken by Z. M..