Which packaging innovation in the 1950s-60s led to a dramatic increase in the affordability and distribution of religious texts worldwide?

Religious texts and spiritual materials have undergone fascinating packaging transformations throughout history. From ancient scrolls to modern digital formats, the way wisdom is presented impacts how it's received. This poll explores a significant packaging innovation that revolutionized access to religious texts in the 20th century. Test your knowledge of how product packaging has shaped the distribution and accessibility of spiritual materials!

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Mass-market paperback editions with thin, flexible covers
Leather-bound collector editions with gold leaf embellishments
Audio cassette recordings of religious texts
Microfilm preservation systems for ancient manuscripts