Such notions are not mere flights of fancy. High school physics students learn about theoretical astronauts of the future who will travel into space faster than the speed of light and thus return even younger than when they left. Theories that seemed wildly speculative just a decade ago are being proved by modern researchers who bounce laser beams off the moon and send atomic clocks into space. Science is fulfilling fantasy: “It is a poor memory indeed that only works backwards!” said the White Queen to Alice in Wonderland.
