We're all walking around in a soup of Wi-Fi signals, but researchers say they can be put to another use -- counting people.
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Three Japanese who succeeded in inventing efficient blue light-emitting diodes (LEDs) where many companies had failed have won the Nobel Prize in Physics.
Researchers have developed mobile robots that can use Wi-Fi signals to effectively "see through" walls. It's raising the possibility of flying drones using the technology to see inside buildings.