The Human Chain on Instagram: "Mark Rober is an American engineer, inventor, and massively popular science and technology YouTuber, celebrated for transforming complex engineering principles into wildly entertaining and accessible content. Before becoming a full-time content creator, Rober spent nine years as an engineer at NASA's Jet Propulsion Laboratory (JPL), where he notably worked on the Curiosity rover. His transition from designing hardware for Mars missions to designing elaborate, often