humans

The Earth's 4.5-billion-year history is a story of constant change, marked by shifting continents, evolving life forms, and environmental upheaval. While the fossil record tells a tale of biological progression culminating in modern humans, some scientists and thinkers ponder an intriguing question: Could there have been other civilizations on Earth that existed millions—or even billions—of years ago, only to vanish without a trace? This speculative idea challenges our understanding of history, geology, and evolution, and opens the door to captivating hypotheses about what might have transpired during Earth's vast prehuman epochs. One of the biggest obstacles to uncovering evidence of…