Which scientific innovation was initially sold in 1955 for $0 with an unusual pricing strategy where Jonas Salk famously stated, 'Could you patent the sun?'

The commercialization of scientific breakthroughs often involves fascinating pricing strategies that balance research recovery costs, market accessibility, and public health concerns. This poll explores a notable case where a revolutionary scientific product's pricing strategy became as famous as the product itself, sparking debates about ethics in scientific commercialization that continue to this day.

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Polio vaccine
Penicillin production method
DNA sequencing technology
X-ray imaging device