Paula Apsell is realistic about the power of television. 'The quality of the program and the size of the audience have almost nothing to do with each other,' admits the senior executive producer of the wgbh 'Nova' science unit. 'These are terrific programs, but they're not the kind of television people will naturally watch. In a series like this you do what you can, short of putting dirty pictures in it, to try to extend it to a larger audience.'

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