fourth dimension

Chronologist Sam Magruder is sucked into the age of dinosaurs while working on an experiment on the quantum theory of time-motion in the year 2162, and leaves slabs of writing that chronicle his experiences for future generations to find.

Explores the intellectual threads that lead to some of the most important ideas and discoveries in modern astrophysics and cosmology, including binary stars, black holes, gamma-ray bursts, wormholes, and string theory.

Matt, Emily, and Jonathan travel to Washington, D.C. in 1865 and try to stop the assassination of President Lincoln.

While working on a last-minute President's Day assignment Max accidently triggers a time machine and brings young Abraham Lincoln into the 1990s. Abe is a pretty cool guy, but Max is afraid that if he can't find a way to send Abe back the entire course of history will change.

Sixteen-year-old twins Harry and Barry stumble across a gateway to another universe, where a distortion in time and space causes a dramatic change in their competitive relationship.

Dr. Louis J. Kibbleman the 822nd causes havoc on present-day Earth when he sets out on a time-traveling mission from the year 6789 to find a recipe for ketchup--the fuel that powers the world.

Relates the adventures of a scientist who invents a machine that transports him into the future.

A scientist invents a time machine and uses it to travel into the future, where he discovers the childlike Eloi and the hideous underground Morlocks.