The Top Martin Gardner Scientific American Articles (2014)
blogs.scientificamerican.com
blogs.scientificamerican.com
1. Look up the DOI of the article on Nature's website, e.g.:
https://www.nature.com/scientificamerican/journal/v199/n2/in...
(un)conveniently, you can't find DOI on the page linked from the OP's article.
2. Use the DOI to look up the paper on http://sci-hub.se (or one of its mirrors), e.g:
http://sci-hub.se/10.1038/scientificamerican0858-100
3. (deprive the publisher of) Profit!