Last August, I came up with this wild theory that the August 1, 2018 core update was more focused in on medical and health/wellness types of web sites. Google said no, it was across all categories but a lot of the data showed that while it did hit all categories of sites, there seemed to be more focus by a lot on the medical/health space....
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Google Implies It Got Better At Judging Quality Of Medical Sites
seroundtable.com