The What Do We Know About? series explores the mysterious, the unknown, and the unexplained. Are the geometric field patterns fact, myth, or legend? Presenting What Do We Know about: an exciting new addition to the #1 New York Times Best-Selling Who Was? series! What Do We Know About Crop Circles? lets curious young readers learn about the phenomenon of crop circles and how they came to be one of the most studied mysteries of the natural world. Read about all of the rational and fanciful explanations for these flattened patterns in crops all over the world, from the United Kingdom to Australia. Artists and hoaxers alike have claimed credit for these massive projects, but some people think that the source could be paranormal. Are these circles an elaborate prank, or could they be something more?