Where’s the backscatter X-ray for the neighborhood sidewalk, the school or our bedrooms?

This “ambient backscatter communication” enables devices to send data without an active radio, which would require a battery or some other built-in energy source.

That includes 231 periscopes for Israeli armored vehicles, 51 “Z Backscatter” mobile X-Ray vans for Iraq and 21.5 million tracer cartridges for Morocco.