七：1。清洗时调设备磨刷所致。2。成品检验员误放所致，当时有挑选出来2片。
Seven: 1. ShiDiao cleaning equipment caused by abrasive brush. 2. The finished product inspectors mistakenly put, and there was selected by 2 slices.
但取代之的是，该研究人员发现一些远更惊人的事实：“当我检验头骨内部，我的手刷过一细微的突出物。”
But instead the researcher found something far more extraordinary: "As I examined the interior of the skull, my hand brushed across a tiny protrusion."
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