Neil deGrasse Tyson explores the cosmos in his new book, "Merlin's Tour of the Universe," where he answers readers' questions on galaxies, black holes and more. He joins "CBS Mornings" to share more his cosmic journey.
New evidence could help out investigators determine what led to the disappearance of 84-year-old Nancy Guthrie from her Tucson, Arizona, home as the frantic search to find her continues....