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![Mark Rober](/uploads/profile_image/fc2/4e5f09fa-8c7c-4e67-9372-21a1aa125fc2.jpg?m=1576154041)
Mark Rober
YouTube Channel
Former NASA engineer. Current YouTuber and friend of science. Answers to some common questions: ...
YouTube Channel
Former NASA engineer. Current YouTuber and friend of science. Answers to some common questions: ...