Four new titles in this best-selling series examine the evidence or lack thereof for these supernatural legends. Reviews of the first six books called the series "solid stuff for teaching high-interest critical thinking," (Booklist) and said, "These books will spark classroom debate," (School Library Journal). Curious minds want to know: are these things real? Read and decide for yourself Presents stories of crop circles, designs that appear in crop fields, often overnight. Examines the evidence of various explanations."