Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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"It can be a couple of months but it can also be a couple of years," he said. "If the jobs are really lost due to outsourcing or AI, then unless we find in a couple of years actually we still need those people and replacing them didn't work, then those jobs are gone."
If robots are to become more sophisticated, they will have to have more efficient, more precise and more intelligent actuators.