Ancient cave decorations can be breathtaking to behold, but new research claims the artists may have been starved of oxygen when they were painting.
원문출처 : https://www.cnn.com/style/article/cave-art-study-scli-intl-scn/index.html
원문출처 : https://www.cnn.com/style/article/cave-art-study-scli-intl-scn/index.html