I had this pointed out to me just now about the #bullshit #dyson are peddling now about having a 'scientific' #hoover https://www.dyson.com/newsroom/overview/.. Apparently it's 'special' laser will help see particles and the dust will hit an acoustic piezo sensor that counts them? And then it will display this data on a screen to scare the shit out of clean freaks to buy an even more powerful hoover to reach the impossible goal of zero dust...