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This is hard science fiction and not much happens in the way of action - most of the book consists of scientists talking amongst themselves as they gradually unravel the mystery of a humanoid found on the moon 50,000 years after he died. I liked it up until the last chapter and epilogue which had me plumbing the depths of my brain to recall what I knew about the human evolution timeline and the history of the moon. I just couldn‘t buy the ending.