I searched "particle" (as in physics etc...) and got "article not found". What's up with that?
The point of sci-hub is that it fetches specific articles for you, not to be a search engine. Find an article you want - for example, the PolderCast paper[0] - then enter a link or the DOI for that article, and it'll find the paper most of the time.
Could you advise any good resource to discover interesting articles?
Unfortunately not, I tend to find something close to what I want via Google and then find papers that it references, and papers that reference it. Review articles are useful, as are benchmark comparisons that you find in some papers.
Searching for the title of a paper also seems to work really well.
In addition to other suggestions here, you can also simply add ".sci-hub.cc" to the end of the domain part of the URL when confronted with a paywalled paper.
I find this the easiest interface. It allows me to search using standard search engines (PubMed, Google Scholar etc) the duck into sci-hub as required.
I have a bookmarklet for this: javascript:document.location.hostname=document.location.hostname + ".sci-hub.cc";
A direct URL to a paywalled paper, or a DOI number.