Which scientific breakthrough significantly advanced retail IoT applications by enabling passive, battery-free sensor networks throughout stores?

The Internet of Things (IoT) has transformed how science and retail interact, creating unprecedented opportunities for data collection, customer engagement, and inventory management. Smart sensors now monitor everything from shelf temperatures to customer foot traffic patterns. This poll tests your knowledge of a significant scientific advancement that revolutionized retail IoT applications and changed how businesses gather consumer insights.

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RFID backscatter technology that harvests energy from ambient radio waves
Quantum dot semiconductors that generate power from store lighting
Piezoelectric floor tiles that capture energy from customer footsteps
Thermoelectric generators that convert HVAC temperature differentials into power