A mathematician tries to convince his machinist friend to travel through time with him, leading to a heated discussion of man’s hubris and the possible paradoxes that could open up if they disturb the time-space continuum.

In the far future, an invention called "the prism" uses quantum mechanics to cause divergences in future timelines and create a means of communication across these alternate realities. Two different women explore the choices they have made in their own lives and the regrets they harbor--and have to figure out how to ultimately make peace with their decisions.

In a future Boston, a passenger train disappears from a subway system so complex the system creates a second dimension. Government officials work to retrieve the missing car, but struggle to solve the impossible mathematic equations the system created.

Through three tales of impossible machines with abilities to manipulate the physical world, travel through time and space, and bestow telepathy onto an entire community, candidates of an engineering exam in the far future are asked to ponder fantastical implications of technology.

While waiting for an unrequited love to return, an elderly woman ruminates on her role in discovering an elegant alien technology. She feels death approaching and regrets not seeing her love again before she passes—only for him to arrive in the nick of time.

A young man struggles to rationalize with fate as he watches the people he loves experience immense pain and suffering. As he learns more about the physics of the universe and slowly teaches himself how to travel through time, he begins experiencing surreal moments where he can actually see the alternative paths he and his loved ones could have taken, and how they would all have been different if they had.

In an alternative timeline, a physics-loving, homosexual British mathematician finds himself alive and given a second chance at pursuing his studies.

Mrs. Berthelson is the only human that can travel through time, so she journeys to a post-apocalyptic Earth where she tries to sell life-saving supplies to the last surviving humans as they are about to escape the planet.

In a world where telling time is illegal, Newman is a death-row prisoner for attempting to do just that.

A stranger from the faraway future appears in a young man's room in 1952 with an urgent mission.