How does author, Lisa Randall, challenge old ideas in the book, Dark Matter and the Dinosaurs?

Sometimes, even scientists who are supposed to maintain "broad and open minds," as Lisa Randall describes it, have favorite ideas and notions to which they are attached. The history of science is nothing if not a testament to the meaningful exchange of ideas made possible through a friendly and collaborative spirit. New ideas are often resisted, or even fought. Some of these include the notion that earth is flat, or that the sun revolves around the earth, or that humans evolved from ape-like ancestors. In modern times, scientists have come to use the standard of whether a new idea or theory is "elegant" to determine its value in an intuitive fashion.