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A comment on An extrasolar world covered in water?. Parent comment

Re:An extrasolar world covered in water? by bil7 on Thursday September 01, 2022 @12:36PM (#32678946)
I've had vivid dreams where I was completely convinced I was in reality. Continuity was maintained well enough to fool me. How could I know I wasn't in a dream? How can I truly know beyond doubt that I am not in a dream?
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