The Glue So Bad It Made Billions

In 1968, a 3M chemist made a glue so weak it was called a failure. For years nobody wanted it. When it finally hit shops, it flopped, and 3M almost gave up for good. Today, billions of Post-it Notes are sold every year. This is the story of how a glue that couldn't glue became one of the most-used things on Earth, and the one trick that saved it. #postitnotes #inventions #history