Costa Rica

Doris Z. Stone

an American archaeologist who first brought attention to the stone spheres of Costa Rica in the 1940s. She conducted extensive research on the spheres and suggested that they may have been used as boundary markers or symbols of power.

Ifigenia Quintanilla

a Costa Rican archaeologist who has conducted research on the stone spheres of Costa Rica since the 1960s. She has suggested that the spheres may have been used in astronomical observations or as part of a fertility cult.

John W. Hoopes

an American anthropologist who has conducted extensive research on the pre-Columbian peoples of Central America, including the stone spheres of Costa Rica. He has suggested that the spheres may have been used as part of a ballgame played by the indigenous peoples of the region.

Jorge A. Jiménez

a Costa Rican geologist who has conducted research on the composition and age of the stone spheres of Costa Rica. He has used radiocarbon dating and other methods to determine that the spheres were likely created between 600 AD and 1000 AD.