In "Timeline" by Michael Crichton, a group of archaeologists and historians are given the opportunity to travel back in time to the 14th century. As they venture into the past to rescue their colleague, they find themselves caught in a dangerous and unpredictable world. Faced with medieval warfare, treachery, and the challenges of adapting to a different time period, they must race against time to survive and make it back to the present.

In "Oh Pure and Radiant Heart," three scientists responsible for the development of the atomic bomb—Oppenheimer, Fermi, and Szilard—mysteriously appear in the 21st century. Unaware of how they got there, they confront a world shaped by the very technology they helped create. As they grapple with their feelings of guilt and responsibility, they become involved with a librarian and her husband, embarking on a journey that takes them across the United States. The narrative weaves together the past and the present, exploring the impact of nuclear weapons on humanity and the scientists' quest for redemption in a world on the brink of forgetting the horrors of the past.