Which famous invention was first marketed with the tagline "A Little Light Reading"?

Behind many groundbreaking inventions and discoveries are memorable taglines that helped cement these innovations in the public consciousness. These marketing phrases sometimes become as iconic as the inventions themselves, capturing the essence of how these products revolutionized our lives. Test your knowledge of how some of history's most significant inventions were first introduced to the world through their advertising slogans.

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The Kindle e-reader
The incandescent light bulb
The pocket flashlight
The fluorescent desk lamp