Cranks are individuals who hold unconventional beliefs or ideas that are often not supported by scientific evidence. They may passionately advocate for their views, which can range from alternative medicine to conspiracy theories. Cranks typically reject mainstream opinions and may distrust established institutions like science or government. While some cranks may simply be misinformed, others can be more extreme, promoting harmful practices or misinformation. Their influence can spread through social media and other platforms, making it important for the public to critically evaluate claims and rely on credible sources for information.