The cave kept its visitor for thousands of years without explaining him, and it may keep its central secret indefinitely — a reminder that even the most sophisticated science has limits, and that the people of the deep past were complex enough to take some of their story with them when they went.

The Early Holocene World He Inhabited

Approximately 8,800 years ago, the world was in the middle of one of the most significant ecological transformations in the history of the post-glacial period.

The Last Glacial Maximum — the peak of the most recent Ice Age, when continental ice sheets covered large parts of North America, Europe, and Asia — had ended roughly 10,000 to 12,000 years before the Hourglass Cave man was alive.

But the transition from glacial to post-glacial conditions was not a single event.