When "Star Trek" legend William Shatner and America's favorite astrophysicist Neil deGrasse Tyson share the stage, sparks can fly on an astronomical level. They talk with Luke Burbank about their bromance built on an appreciation of science; the two-man show ("The Universe Is Absurd!") that grew out of a trip to the South Pole; and how curiosity about the cosmos can help keep one young.

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