Which famous entrepreneur famously spent 5 years testing over 5,000 prototypes before launching their revolutionary household product line?

Many celebrities have leveraged their fame to create successful product lines, but launching a brand requires more than just star power. The most successful celebrity entrepreneurs understand product development fundamentals, from market research to prototype testing. This poll tests your knowledge about how famous personalities transformed their ideas into retail empires through strategic product development processes.

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James Dyson, who tested 5,127 prototypes before launching his first bagless vacuum cleaner
Kylie Jenner, who tested 5,400 lipstick formulations before launching Kylie Cosmetics
Rihanna, who developed 5,200 foundation shades before finalizing the Fenty Beauty line
Elon Musk, who rejected 5,300 battery designs before settling on the Tesla Powerwall configuration