BuiltForAReason

3M scientist Spencer Silver invented the world's weakest glue in 1968. He thought it was a failure. Nobody wanted it. 6 years later, a colleague used it to stop bookmarks falling out of his hymn book at church.

Before 1940, road workers used wooden sawhorses to block traffic. They were heavy, expensive, and killed people when cars hit them. A painter named Charles Scanlon got tired of watching workers get hurt.

But when he lit a cigarette in frustration, the device went off. It detected smoke instead. His failed poison detector became the smoke alarm. It now saves over 1,000 lives a year in the US alone. A cigarette smoked in frustration is why your house has a smoke alarm. 🔩

For most of history, the only way to know your house was on fire was to smell it or see it. In 1939, a Swiss physicist named Walter Jaeger tried to build a poison gas detector. It failed completely — it couldn't detect gas at all.

He built a hollow rubber cone you could kick out of the way and it wouldn't injure anyone. He patented it in 1943. There are now over 140 million traffic cones on Earth. One painter's frustration put an orange cone on every road in the world. 🔩 Which object should I cover next?

The "useless" glue became the Post-it Note. 3M now sells 50 billion a year. The biggest office product in history was born from a failure nobody wanted and a church choir. What everyday object do you think has the strangest origin? 🔩

3M scientist Spencer Silver invented the world's weakest glue in 1968. He thought it was a failure. Nobody wanted it. 6 years later, a colleague used it to stop bookmarks falling out of his hymn book at church.