Which famous historical inventor personally recruited Albert Einstein to endorse their product, resulting in one of history's most unexpected celebrity endorsements?

Throughout history, famous inventors and their groundbreaking discoveries have occasionally partnered with celebrities for product endorsements, creating fascinating marketing stories. Some of these partnerships changed how inventions were adopted by the public, while others created unexpected cultural moments. Test your knowledge about these unique intersections of celebrity and innovation that helped shape the commercial success of world-changing inventions.

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Thomas Edison had Einstein endorse his improved phonograph in 1921
Alexander Graham Bell had Einstein promote the long-distance telephone service in 1916
Rudolf Diesel convinced Einstein to publicly support diesel engine technology in 1923
Theodor Svedberg had Einstein endorse his ultracentrifuge invention with a signed promotional photograph in 1926