Two scientists’ trek showed how people of Chaco Canyon may have hauled logs
The researchers literally put their heads together to solve this transportation mystery

James Wilson (left) and Rodger Kram (right) carry a ponderosa pine log using head straps called tumplines. The two scientists suggest that this is how ancient people of Chaco Canyon hauled timber across more than 75 kilometers about 1,000 years ago.
Patrick Campbell/CU Boulder