By THE PULSE NEWS MEXICO STAFF     Scientific and archeological research has resumed at the pre-Hispanic Maya archeological site Yaxchilán, in Mexico’s southern state of Chiapas, according to sources at the National Institute of Anthropology and History (INAH). The site, first explored by English archeologist Alfred Percival Maudslay at the start of the 20th century, is located next to the Usumacinta River.