Is time travel possible?
This is a topic that has puzzled human understanding for centuries. "The answer is definitely affirmative," says distinguished theoretical physicist Paul Davies. With scientific accuracy and witty humor, he continues: "To visit the future, all we need is a little help from gravity and a spaceship that can travel at a speed slightly less than that of light. As for going back to the past, the best way is to find a neighboring black hole equipped with a traversable wormhole."
However, time travel is riddled with "paradoxes," at the heart of which lies the problem of causality: what happened yesterday affects what is happening today. The most well-known of the time travel paradoxes is the one where the traveler goes back to the past and kills his own mother...
Exceptionally imaginative and theoretically grounded, the book "Time Machines" is "creative science at its best moments." The book enlightens, entertains, and provokes thought.