The mysterious stone spheres of Costa Rica were discovered in the 1940’s in the southern part of the Province of Puntarenas, near the towns of Palmar North and South. The stone spheres were discovered when the United Fruit Company started to develop banana plantations in this part of Costa Rica. The first scientific archeological reports were published in 1943 and since then the spheres have attracted the interest of scientists ever after. The stone spheres are made out of a hard stone called granodiorite and vary in size. The smallest spheres only have a diameter of a couple of centimeters, the biggest known sphere’s diameters more than two meters. Speculations about the origin and purpose of the Costa Rican spheres have risen to preposterous dimensions. The indigenous people who made them possessed a substance to soften stone, the spheres originate from the Lost city of Atlantis, extraterrestrial influences are involved and a lot of other stories. It is estimated that there are a couple of hundred stone spheres, but unfortunately the majority is relocated. All over Costa Rica, especially in front of official buildings, a sphere is a favorite decorative item. Some of the stone spheres were placed in groups, that suggest that a connection with the magnetic north, but since few stones were discovered in their original position, this theory has little substance. Archeologists and anthropologists reached some consensus on the fact that the stone spheres were made by the indigenous forefathers of the present day Boruca, Teribe and Guaymi tribes and can be dated somewhere between 200 before Christ and 800 AD. The story goes that the spheres are perfectly round, what must have been hard to achieve since the shaping of the hard stone must have been a painstaking process. Recent laser measurements however show some design flaws with an average accuracy of 96%. The stone spheres could be shaped by using stone tools and using the method that by heating and suddenly cooling the stone, parts could easily be chipped off. Polishing would be the last stage. As said before most of the stone spheres have been relocated all over Costa Rica and have been damaged by moving or excavation which makes it hard to come to scientific hard conclusions. For anybody who wants to get in touch with the scientific results about the stone spheres of Costa Rica should do some research and check out the website by J.W. Hoopes, Department of Anthropology of the University of Kansas. That way you can make up your own mind what srories you believe about the stone spheres of Costa Rica.