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How do scratch-and-sniff stickers work?

2 min•21 november 2014

Om avsnittet

Scratch-and-sniff stickers are novelties that delight both children and adults. Sniff out the ingenious technology that makes them work in this podcast from HowStuffWorks.com.

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How do scratch-and-sniff stickers work?

Om avsnittet

Fler avsnitt

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