In which year did National Geographic introduce its now-iconic yellow rectangular border on magazine covers, creating one of the most recognizable brand identities in natural world publishing?

National Geographic has been documenting the natural world for over a century, evolving from a scholarly journal into a multimedia powerhouse. Their brand history reflects changing attitudes toward conservation, exploration, and environmental awareness. This trivia question explores a pivotal moment in their brand development that shaped how millions experience the natural world through their distinctive visual identity.

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1888 (the year of the magazine's founding)
1910 (becoming the magazine's signature visual element)
1935 (coinciding with their first color wildlife photography)
1970 (as part of an environmental awareness rebranding)