Guatemalan ‘potbelly’ sculptures suggest people knew about magnetism more than 2,000 years ago HEADS UP Colossal stone heads from an ancient Guatemalan site contain magnetic fields on the right temple and cheek, spots that apparently held special significance for makers of the New research provides the first detailed look at how these sculpted body parts were intentionally placed within magnetic fields on large rocks. The researchers studied 11 potbelly sculptures, six heads and five bodies, now displayed in a Guatemalan town. At least 127 such sculptures have been found at sites in Mesoamerica, an ancient cultural region that runs from...