World's oldest calendar could rewrite the birth of civilization

Archaeologists have discovered what is thought to be the world's oldest calendar.

Etched in a 12,000-year-old stone pillar at the mysterious Göbekli Tepe site in Turkey, experts say it could rewrite our timeline.

The timekeeping system strongly suggests ancient humans had accurate ways to keep time 10,000 years before it was documented in Ancient in 150 BC.

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