Mark Rober(@MarkRober) 's Twitter Profileg
Mark Rober

@MarkRober

Former NASA and Apple engineer. Current YouTuber and friend of science. CrunchLabs founder- https://t.co/3UMhZ5kV9h

ID:490932793

linkhttp://youtube.com/markrober calendar_today13-02-2012 02:20:43

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