What could be lost in our past?

In this video I discuss the limitations of paleontology and science and speculate what could be missing or lost to history and time. I ask a very strange question: Could there have been civilizations or cultures made by other non-human organisms? ...sorry if it seemed like I went off the deep end with this one. XD I don't believe there were past civilizations or intelligences, it's just something I would love to be wrong about and find evidence of. All I am doing in this video is asking the question. Hope you enjoy! Please check out C.M. Kosemen's stuff: Tangent Realms: https://tangent-realms.backerkit.com/... and http://www.TangentRealmsMovie.com Tumblr: http://cmkosemen.com/about Deviantart: https://nemo-ramjet.deviantart.com/