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Mark Rober: TIME100 Creators 2025

Science

From the Left

Mark Rober doesn't just understand science,he knows how to make people care about it. The former NASA engineer turned content creator has mastered the modern art of turning complex concepts into viral entertainment. Since launching his YouTube channel in 2011, Rober has drawn more than 12 billion views and amassed 69 million subscribers, who regularly tune in to watch him apply scientific principles to backyard experiments; some resemble high school cafeteria stunts—like testing whether a person can swim in Jell-O—while others solve real-world problems, such as building an obstacle course...

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