Which innovative product design feature was first introduced in the 1880s to make Bibles more accessible and remains popular in many religious texts today?

Religious texts are among the oldest and most influential products in human history. Their production, distribution, and consumption have evolved dramatically over time, from hand-copied scrolls to digital applications. This trivia question explores an interesting innovation in religious text publishing that changed accessibility for millions of believers. Test your knowledge about how technology has transformed the way people engage with sacred writings!

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Red letter edition (printing Jesus's words in red)
Thumb index tabs for quick navigation to specific books
Dual-column layout with cross-references
Waterproof pages for baptismal ceremonies