Which scientific product was NOT initially rejected by its now-famous brand before becoming one of their bestsellers?

The world of science has produced groundbreaking products that have changed our lives. Behind many of these innovations are powerful brands and strategic marketing decisions. This poll tests your knowledge of how famous scientific products were brought to market and the companies that made them household names. Can you identify which scientific innovation was paired with the correct company and branding story?

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Post-it Notes by 3M, initially shelved for years because the adhesive was deemed 'too weak' for commercial applications
WD-40 by the Rocket Chemical Company, which failed 39 times before the 40th formula worked (hence the name: Water Displacement, 40th attempt)
Viagra by Pfizer, originally developed as a heart medication before researchers noticed its unintended side effect
Dyson vacuum by James Dyson, rejected by established manufacturers after 5,126 prototypes before he launched his own company