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“Cannot be explained” – New ultra stainless steel stuns researchers
(www.sciencedaily.com)
This is a most excellent place for technology news and articles.
If something in a headline is in quotes, it should be a direct quote. In this case, they are following that standard. It's a direct quote of Dr. Kaiping Yu who worked on the research.
It also happens to make for a very catchy headline.