3M scientist Spencer Silver created the adhesive that makes Post-It Notes sticky back in 1968 - but it wasn’t until 6th April, 1980 that the stationery product we all know and love was first released to consumers, in a promotional effort the company termed ‘The Boiasie Blitz’.

The problem? His "invention" wasn’t what his company wanted. Rather than strong, industrial-grade glue, Silver had accidentally made the opposite—an adhesive that was weirdly weak but could be stuck and removed multiple times. A "solution without a problem," as he put it.

Fast forward to 1974, and fellow 3M scientist Art Fry had a eureka moment while struggling with loose bookmarks in his church hymnal…

In this episode, Arion, Rebecca and Olly reveal how a mass giveaway was the key to unlocking the viral marketing power of this ‘self-advertising’ product; discover why the notes’ now-iconic yellow colour came about; and discover an out-of-court settlement that arguably casts some doubt on the product’s remarkable origin story…

Further Reading:

• ‘The Invention of the Post-it® Note’ (National Inventors Hall of Fame): https://www.invent.org/blog/trends-stem/who-invented-post-it-notes#:~:text=At%20first%2C%20the%20reception%20was,launched%20across%20the%20United%20States.

• ‘The ‘hallelujah moment’ behind the invention of the Post-it note’ (CNN Business, 2013): https://edition.cnn.com/2013/04/04/tech/post-it-note-history/index.html

• ‘Fun With Sticky Post-It Notes’ (CBS, 2008): https://www.youtube.com/watch?v=YYPjdfPlOjE

Love the show? Support us! 

Join  🌴CLUB RETROSPECTORS🌴to DITCH THE ADS and get an additional full-length episode each SUNDAY… 

… Plus, get weekly bonus bits, and unlock over 100 bits of extra content. 

Join now with a free trial on Apple Podcasts or Patreon and support our show ❤️

The Retrospectors are Olly Mann, Rebecca Messina & Arion McNicoll, with Matt Hill.

Theme Music: Pass The Peas. Announcer: Bob Ravelli. Graphic Design: Terry Saunders. Edit Producer: Ollie Peart.

Copyright: Rethink Audio / Olly Mann 2026.

#Inventions #Discoveries #Business #80s

Learn more about your ad choices. Visit podcastchoices.com/adchoices