The Top Ten Unexplained Technologies

This countdown episode revisits ten artifacts that ancient astronaut theorists argue may represent advanced or extraterrestrial technology. At number ten, the Dendera light bulb—a carving in Egypt's 2,000-year-old Hathor Temple—shows what Giorgio Tsoukalos and engineers interpret as an incandescent bulb complete with filament, cable, and power source. Theorists note the surrounding hieroglyphics reference a "bringer of light" and argue the image solves a longstanding puzzle: how Egyptians illuminated deep underground chambers covered in hieroglyphics without soot from torches. At number nine, the Baghdad Battery—terra-cotta pots with copper cylinders and iron rods discovered in 1938—appears designed to generate electricity more than 1,800 years before modern batteries, potentially providing the power source for such ancient lighting systems.

Mainstream Egyptologists identify the Dendera carving as a lotus flower, a common religious symbol in Egyptian art, with the "filament" representing the flower's mythological emergence and the surrounding iconography fitting established temple symbolism rather than technical diagrams. The Baghdad Battery's actual function remains debated among archaeologists, with leading theories suggesting use in electroplating, medical treatment, or religious ritual rather than practical illumination. The episode compels even skeptics to consider genuine historical mysteries—how extensive underground spaces were lit during decoration, and what practical purposes unusual ancient containers served—even if the extraterrestrial explanations stretch further than the archaeological evidence currently supports.