Somewhere in our genes lives the memory of a fire in the night. Somewhere in the jumble of our consciousness is the recollection, dimmed by time and circumstance, of a band of us huddled around a flame for security, warmth and community.

Eighty years of exploration and study reveal the secrets of the Crystal Skulls, maybe. In 1924, the famed British banker-turned-adventurer F.A. Mitchell-Hedges led an expedition deep into the Central American jungles of British Honduras (now Belize).