https://pubmed.ncbi.nlm.nih.gov/?term=copper
Before 1967, there were only about 500 articles on copper.
Before 1993, there were only 31,547 results. (1993 is an important year, as we will see later in the chapters on the RDA and tolerable upper human limit, set by the government in 1993)
Before 1999, there were only 41,507 results.
As of 9/30/21, there are 141,832 Articles on Copper at PubMed.gov
As of 10/24/21, there are 142,255 results, another 423 articles in less than a month.
As of 12/02/21 there were 143,153 results, another 1321 articles, in just over two months.
This is discouraging to my efforts. There is no way I could ever read all of the articles.
This is encouraging. With so many articles, copper is important.