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So you believe that a man with his family of eight constructing an ark in a time period of about a century is impossible?
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Aside from them living a century of course.
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A single family spent a century creating an ark that was beyond the technology of the time. The Egyptians with an army of slaves took tens of years to create the pyramids a long time after this flood occurred. And you ignored the space requirements of all the species, the sheer numbers, food and water issues. Everything about it is impossible.