Which packaging design innovation did Guinness World Records introduce in 2007 that revolutionized their annual book's appeal and significantly boosted sales?

The Guinness World Records has documented countless extraordinary achievements since its inception in 1955. Beyond the records themselves, the brand has evolved into a global powerhouse with distinctive branding elements. This trivia poll tests your knowledge about the marketing and design aspects of the world's most recognized authority on record-breaking achievements. How well do you know the business side of world records?

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Lenticular 3D covers that created moving images when viewed from different angles
Thermochromic ink that changed color when touched by warm hands
Embedded digital chips that unlocked exclusive online content
Biodegradable covers made from recycled record-breaking items