Every so often, we encounter a thought, a question, or a fleeting realization that shakes the foundation of what we believe we know. It might come from staring into the vastness of the night sky, pondering the bizarre depths of the ocean, or even wondering why someone sees a different color to the one that we do. These moments are subtle reminders that despite centuries of discovery and invention, much of our understanding of the world, life, and the human condition is still stitched together by assumptions and a shared agreement on how things seem rather than how they actually are.
What does it mean to perceive color, to feel consciousness, to laugh, cry, or exist at all? We often lean on science to provide concrete answers, but even the most rigorous fields are riddled with mysteries, contradictions, and evolving theories. So, what are some of the biggest things that are unknown to humanity? Click through this gallery to find out.