Fringe science refers to scientific ideas and theories that exist outside the mainstream scientific consensus. These concepts often lack rigorous testing and validation, making them controversial among scientists. Examples include topics like UFOs, psychic phenomena, and alternative medicine. While some fringe theories may spark interest or curiosity, they often do not adhere to established scientific methods. Researchers in fringe science may face skepticism from the broader scientific community. This skepticism arises because many fringe ideas do not have sufficient empirical evidence or reproducibility. Despite this, fringe science can sometimes lead to new questions and explorations, pushing the boundaries of conventional understanding.