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Wildfires having devastating effect on air quality in western US, study finds – The Guardian
https://amp.theguardian.com/world/2021/jan/19/wildfires-air-pollution-western-us
Sure Signs Youve Already Had COVID, According to Patients – Yahoo Lifestyle
https://www.yahoo.com/lifestyle/sure-signs-youve-already-had-122607716.html
Synthetic cornea helped a legally blind man regain his sight – Engadget
https://www.engadget.com/synthetic-cornea-helps-a-legally-blind-man-regain-his-sight-101057500.html
More than 60% of all US Covid-19 cases were reported since Election Day. Now experts warn a variant could further fuel spread – CNN
https://www.cnn.com/2021/01/19/health/us-coronavirus-tuesday/index.html
