Which of these product innovations was originally developed by Percy Spencer after he noticed a chocolate bar melting in his pocket while working with radar equipment during WWII?

Throughout history, certain product innovations have fundamentally transformed how we live, work, and interact with the world. Some inventions were immediately recognized for their brilliance, while others took time to gain appreciation. This trivia challenges you to identify a groundbreaking product innovation that revolutionized an unexpected industry through clever application of existing technology rather than creating entirely new science.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The microwave oven (Radarange)
Teflon non-stick coating
Super Glue (cyanoacrylate adhesive)
Post-it Notes