Well its a great Question, I think the best way to preserve a message for 50,000 years and also be understandable to the people is to make draft of useful information e.g rock carving,books,hard disks etc in large cylinders. Make many copies of it and bury some of them in sea, under the earth, below the polar ice, project them in space as a sattalite, send them on moon.someone in future will sure find it.
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