I was looking for an article, typed in (without quotes) 'flu' under 'titles' and got "Nothing matched your criteria." I then type in under 'keyword' and get innumerous articles with 'flu' in the title. IOW, search failed. Bigly. I'm not asking tongue-in-cheek: I genuinely want to understand this obvious glitch. In this case, I found what I wanted. But I'm of the opinion that many have had the same experience and also have the same question.