Which of these major inventions was originally developed by its company for a completely different purpose than what made it famous?

Throughout history, many groundbreaking inventions and discoveries have fascinating origin stories involving unexpected corporate pivots, happy accidents, or strategic brand transformations. This trivia tests your knowledge of how certain iconic products came to be, revealing the surprising history behind innovations we now take for granted. Do you know which famous product's development story is truly revolutionary?

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Post-it Notes, which 3M initially developed as a super-strong adhesive but commercialized after discovering its weak stickiness was actually useful
The microwave oven, which Raytheon deliberately designed as a cooking appliance after noticing radar operators were using the technology to heat food
Play-Doh, which was originally marketed by Hasbro specifically as a children's modeling compound from its first formulation
WD-40, which was created by the Rocket Chemical Company specifically as a water displacement spray for consumer household use