A pair of archaeologists, one with Adam Mickiewicz University in Poznań, the other with the University of Warsaw, both in Poland, has found evidence suggesting that rock carvings found in a southern part of Peru may have been inspired by people singing while consuming hallucinogenic plants. In their study, published in the Cambridge Archaeological Journal, Andrzej Rozwadowski and Janusz Wołoszyn analyzed rock carvings found in Toro Muerto. Toro Muerto, ("dead bull" in Spanish) is a rock art complex in South America situated in a desert gorge near the Majes River Valley, spanning 10 km2. It hosts approximately 2,600 volcanic boulders,...