Phobic is the name given to people who are unable to step, even by use of a stepper box. To travel to parallel earths, they have to be carried, by someone who is able to step.
A rough estimation says a fifth of the population are believed to be phobics.
Extreme phobics cannot even be carried as they would die in the process, unless given a type of drug immediately after.
- ↑ The Long Earth - Chapter 24
- ↑ The Long Mars - Chapter 1