In this talk, Fadel Adib will discuss two new technologies that bring extreme positioning to billions of deployed RFIDs. The first is two-frequency excitation, a new physical layer technology that can achieve extreme positioning accuracy (of sub-centimeter precision) on battery-free RFIDs. The second is a full-duplex relay design that can scale the coverage battery-free networks by 10x-100x through a drone-based architecture. Finally, he will describe how these technologies can enable new applications in virtual reality, robotic manipulation, and smart manufacturing.