I was thinking what is my light source if I were an ancient human. I think it is hard to get metals, so I probably use wood related material. Also I like food, so I use plants' oil. But how do we find oil in wood or food? Peanut? By extracting it?saw butter?Is there any method that is better than olive oil lamp method?https://youtu.be/nVi2dBkCpZ0
https://ja.m.wikipedia.org/wiki/%E3%82%AA%E3%82%A4%E3%83%AB%E3%83%A9%E3%83%B3%E3%83%97
https://ja.m.wikipedia.org/wiki/%E9%9B%BB%E7%90%83
https://zh.m.wikipedia.org/zh-tw/%E8%90%A4%E5%85%89%E7%B4%A0
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