Extra dimensions allow shortcuts through space-time.

Evidence

Of course, extra space-time dimensions are a commonplace of science fiction indeed, they provide an ideal way of overcoming the normal restriction of general relativity that one cannot travel faster than light or back in time (see Chapter 10). — Hawking, Stephen, A Brief History of Time, 317

Categorization

• corroborated: 2 independent passages support this claim — Hawking, Stephen, A Brief History of Time, 317