For over 25 years, the books in DK's Eyewitness series have been the most trusted nonfiction resource in classrooms, libraries and homes around the world, and in the summer of 2014, this award-winning series was given a fresh new look both inside and out, including the introduction of paperback editions, eye-catching jackets and updated interiors to ensure that the Eyewitness series will continue to be relevant in the ever-changing world of education. Simultaneous.