Which packaging innovation revolutionized vaccine distribution by solving the 'cold chain' problem in developing countries?

Scientific advancements often require innovative packaging solutions to preserve integrity, ensure safety, and maintain efficacy. From pharmaceutical developments to chemical reagents, the packaging of scientific products has evolved dramatically over decades. This poll tests your knowledge about a significant packaging innovation that revolutionized how certain scientific products are stored and transported. Do you know which packaging breakthrough changed an entire scientific industry?

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The Vaccine Vial Monitor (VVM) - a heat-sensitive label that changes color when a vaccine has been exposed to excessive heat
RFID-embedded syringes that track temperature fluctuations during transport
Self-cooling aluminum vials that activate when temperatures rise above safe levels
Vacuum-sealed glass ampules with titanium oxide coating for UV protection