Which marketing campaign famously used the tagline "It's elementary, my dear Watson" to promote a groundbreaking scientific computing system?

Scientific advancements often require effective marketing to gain public attention and funding. Some marketing campaigns for scientific products and discoveries have fundamentally changed how science is perceived by the public. Test your knowledge of significant marketing campaigns that helped bring important scientific innovations into the mainstream consciousness.

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IBM's Watson AI system launch in 2011
NASA's Hubble Space Telescope public relations campaign
CERN's Large Hadron Collider public awareness initiative
SpaceX's Falcon 9 reusable rocket promotion