Half a croissant, on a plate, with a sign in front of it saying '50c'
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usb face mask

two phase air breathing aparatus run via usb and human power
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very small and lightweight air balloon (or should I say compartment) fills with air which is purified and sterilized. Like a SCUBA diving unit but much simpler. Takes the air from the air, feeds across a vegetative membrane with LED lights that cause the vegetation to breath in the air and put out oxygen, then through an ionizer and de-ionizer followed by ultra violet and infra red so that any known and dangerous viruses are broken down and reunite into new mutations. This way each person gets a unique and personal plague and we don't all die together in a matter of weeks.
pashute, Mar 31 2020

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       Bad biology [-]   

       The volume and mass of photosynthesizing plants needed to provide closed-circuit oxygenation to a single human is impractically non-portable; take a look at the figures for Biosphere Two (Although the objective there is not just atmospheric life-support, but nutrition).   

       Just the mass of the power storage devices alone would be prohibitive.
8th of 7, Mar 31 2020
  

       Bacteria are true workers so a radically altered bacteria in the membrane? To give cleaning ,+ voltage potential, + drug substrate output . Even the possibility of suicide bacteria with the job of just soaking up viruses.   

       Though, 'designing' cultures is always going to be a severe nightmare.
wjt, Apr 02 2020
  

       // suicide bacteria with the job of just soaking up viruses. //   

       They're called leucocytes, and they're Baked and WKTE.
8th of 7, Apr 02 2020
  

       A teeming outside could also be a possibility.
wjt, Apr 02 2020
  
      
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