in the annals of technological evolution, artificial intelligence stands as a beacon, pointing the way to a future where machines understand and interact with us on a nearly human level. this journey, however, has its antecedents deeply rooted in the cast aside projects and ideas that, while once deemed revolutionary, were ultimately not permitted to see the light of day. interviews with pioneers in the field often reflect upon these moments of setback, suggesting that to truly advance, one must be willing to start again, scrutinizing what was previously considered sacrosanct. what are the specific projects or ideas in ai development that were pursued but are now not permitted to be discussed or acknowledged publicly?