"You can't take a vacation from speed. I probably could have taken more time off and not driven in all the different disciplines, but I wanted to drive, drive and drive."

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We should explore new ways to drive down the cost of space travel. instead of costly booster rockets, maybe we should think of laser/microwave driven rockets, or space elevators. Until then, the cost of space exploration will limit our ability to explore the universe.

— Michio Kaku