What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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OpenAI宣布获得新融资1100亿美元，其中300亿美元来自软银，300亿美元来自英伟达，500亿美元来自亚马逊，投前估值7300亿美元。OpenAI称，公司还与亚马逊签署了战略合作伙伴关系，并与英伟达签订了关于下一代推理计算的协议。随着这轮融资的进行，预计后续还会有更多金融投资者加入。（第一财经）