Which famous product failure accidentally led to the invention of the Post-it Note at 3M in the 1970s?

Even the world's most innovative companies have their share of product flops. Sometimes these failures lead to surprising discoveries or innovations that change industries forever. Test your knowledge about these famous product missteps that unexpectedly contributed to significant inventions or breakthroughs.

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A super-strong adhesive that was too powerful for practical use
A weak, pressure-sensitive adhesive originally intended for aerospace applications
A transparent tape prototype that left yellow residue on paper
A failed attempt at creating biodegradable packaging material