div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader042vdocumentssitereader042viewer2022020522575068081a28ab0f07ae467ehtml5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Early Science in Mexico src=https:reader042vdocumentssitereader042viewer2022020522575068081a28ab0f07ae467ehtml5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© 1956 Nature Publishing Grouppdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader042vdocumentssitereader042viewer2022020522575068081a28ab0f07ae467ehtml5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: Early Science in Mexico src=https:reader042vdocumentssitereader042viewer2022020522575068081a28ab0f07ae467ehtml5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© 1956 Nature Publishing Grouppdiv