One irrefutable proof of a visit to the far past would be to return with a dinosaur egg— a fresh one! Or, take your camera with you, and come back to develop pictures that were taken millions of years ago. But one should be careful of time travel, for it might be true that the dinosaurs weren’t the only ones who used the earth of the Cretaceous age as a battleground. There might have been visitors who came, fought and departed, leaving not a single footprint in the sands of our time.
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