作者: Joseph Selbie

David’s background includes 40 years of scientific work, including astronomy at the University of Arizona and optics at Xerox Palo Alto Research Center. Currently, he teaches about the yugas, ancient world cultures, astronomy, and physics at the Ananda College of Living Wisdom. He has been writing and lec-turing on the topic of the yugas for more than a decade. David lives with his wife at Ananda Village, a spiritual community in Northern California.