Once this technology is developed it can also be used to monitor for other things. Send a swarm of nanobots into the sewer system looking for traces of illegal substances in waste for example. Just have the little buggers "backtrace" through the sewer network to find your house.
Isn't Amazon's own work prior art? This patent was filed in 1997. When did Amazon start giving recommendations? I can't remember.
Once this technology is developed it can also be used to monitor for other things. Send a swarm of nanobots into the sewer system looking for traces of illegal substances in waste for example. Just have the little buggers "backtrace" through the sewer network to find your house.
Have a nice day.