There are dozens of examples of languages purporting to come from extra-terrestrial or other-dimensional sources? Some are channeled. Some are reported by witnesses to sightings as well as contactees and abductees. Some are associated with angelic beings of light. Some are sub-conscious products. Others are examples of possible fraud. While the study of these fragments, elements and accounts is extremely difficult, my guest (author of How to Talk to an Alien) suggests that they may lead to the equivalent of a Rosetta Stone that will enable detailed, two-way communications in an alien language.