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BBC - Travel - The cliff that changed our understanding of time

“Just a bit further, round the next bend,” my guide Jim said, as our fishing boat pitched and rolled in the choppy waters of the North Sea. It was hardly reassuring. But as we lurched from side to side, I reminded myself that the purpose of our trip was worth it. We were re-tracing a 230-year-old voyage that forever changed humanity’s perspective of the history of the Earth – and even of time itself.