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Saturday, October 4

on Gen. Clark and time travel

As a scientist, let me serve as a translator for you. When a scientist says, "there is no evidence for that," what they really mean is "we have no evidence for that." There's an enormous difference between implying something doesn't or can't exist, and admitting we don't know enough about it to say one way or the other. Except, of course, the former makes you sound smarter than our ignorance honestly allows for ("Clark Campaigns at Light Speed," Sept. 30, 2003).

As for Clark's belief that we'll eventually break the light speed barrier being "probably based more on his imagination than on physics," we should keep two things in mind. One, human imagination has been responsible for all advances, including physics. Two, NASA already has a program for studying such "impossible" things.