LOS ANGELES, California, Oct. 21 -- The University of California issued the following news release: * * * A 15th-century Inca building was built for sound. Researchers are working to understand why Key takeaways * UCLA art history professor Stella Nair is collaborating with an interdisciplinary team analyzing a unique Inca building that dates to the mid-15th century. * The building, in the remote town of Huaytara, Peru, appears to have been constructed specifically for the purpose of amplif more PR