This is “Health Investigations with Dr. Know: The Nervous System,” a previously-owned DVD in the original case with original artwork. Produced by Discovery Education in 2007, the disc is in great shape and plays perfectly (double-checked). “Could what you had for dinner be the stuff nightmares are made of? Dr. Know tries to put a couple of bad myths to bed: Certain foods cause bad dreams and it's possible to catch up on lost sleep.”