Practical tests and efficiency of walking

We might be getting closer to understanding how those giant heads on Easter Island ended up there — and no, it’s not aliens! Instead they may have “walked” with the help of ropes. We speak with Carl Lipo, professor of anthropology at Binghamton University in New York, and Terry Hunt, professor of anthropology at the University of Arizona. They have been researching for an answer for more than two decades, and now published two studies with new information about how the moai of Easter Island were built and moved around