The first prehistoric chef who looked out at a field of grass in Africa and said, "dinner!" may have helped our ancestors use new resources in new locations. Roberto Schmidt/AFP/Getty Images hide caption

toggle caption Roberto Schmidt/AFP/Getty Images

Food science guy Alton Brown says the last thing you want to see is flames touching food on the grill. iStockphoto.com hide caption

toggle caption iStockphoto.com

Clean Your Grill, And Other Hot Holiday Tips From Food Network's Alton Brown

  • Download
  • <iframe src="https://www.npr.org/player/embed/153718482/153762092" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript