Steppers in "The Long Earth" series

In Terry Pratchett and Stephen Baxter's "The Long Earth" series, the term "Steppers" refers to individuals who possess the ability to traverse parallel Earths using a simple device called a "Stepper Box." The Long Earth is a multiverse where countless alternate Earths exist, each slightly different from the others. Steppers can "step" from one Earth to another, exploring the infinite possibilities of existence.

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