They passed on lighting fires, making stone tools, wearing clothes, decorating their bodies and all sorts of skills to do with living together as hunters and gatherers.
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From Making Stone Tools 源于制作石器
And scientists believe that making stone tools helped propel that evolution.
而科学家认为，制造石器帮助推进这种进化。
She studies flint-knapping — the art of making stone tools the way our ancestors did.
她研究燧石敲击术，一门我们的祖先制造石器的手艺。
"Some early humans were making stone tools and they were bad at it and so they quit," Williams says.
“一些制作石器的早期人类，发现自己技不如人，于是他们就放弃了，”威廉姆斯说。
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