The popularity of Post-it notes, as discussed in "The Evolution of Useful Things," was primarily caused by:
1. **Their Varied Uses**: Post-it notes became popular due to their versatility in being used for a wide range of purposes. They could serve as reminders, bookmarks, labels, and more, making them highly practical for everyday tasks.
2. **A Prior Need for Them**: The concept of Post-it notes filled a gap in the market where there was a need for a temporary, repositionable adhesive product. People found them convenient for jotting down quick notes or reminders without the permanence of traditional adhesive products.
3. **Widespread Availability**: Another factor contributing to their popularity was their widespread availability in various sizes, colors, and designs. This availability made them attractive and accessible to a broad audience, further enhancing their appeal and usage.
These factors combined to make Post-it notes a popular and essential product that addressed specific needs and provided a convenient solution for numerous everyday tasks.
