New
#1
Ringworld
IIRC, in "Ringworld" by Larry Niven, one of the characters dropped molecule-sized bugging devices to spy on someone.
I don't know if anything has been posted re this technology but it certainly makes for some interesting but at the same time perhaps frightening reading.
Computers in a grain of sand: How ’speckled’ computing will change the world | TechRepublic
IIRC, in "Ringworld" by Larry Niven, one of the characters dropped molecule-sized bugging devices to spy on someone.