Rising as high as 20 feet, ancient stone monoliths in southern Ethiopia are 1,000 years older than scientists previously thought, according to a new study in the Journal of African Archaeology. A Washington State University research team used advanced radiocarbon dating to determine the often phallic-shaped monoliths, or stelae, at the Sakaro Sodo archeological site in Ethiopia’s Gedeo zone were likely created sometime during the first century A.D. The only other attempt to determine the age of the more than 10,000 stele monoliths located at various sites in the Gedeo zone was conducted by French scientists in the 1990s. It...