8:10
knife with a meteorite/Japanese oil challenge/Yonemura Denjiro Science Production
でんじろう先生 [公式]
10:42
【into the field】flintknapping(ナイフ・黒曜石≪obsidian spall≫編)
rabbit smoking_
7:20
The sharpest Japanese knife invented by mankind
41:44
石器作り 黒耀石で石槍を作る
岩宿の石器
