BrainStuff

How do scratch-and-sniff stickers work?


Listen Later

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.
Learn more about your ad-choices at https://www.iheartpodcastnetwork.com
...more
View all episodesView all episodes
Download on the App Store

BrainStuffBy iHeartRadio