Your search result is displayed in two columns: Google search result on the left, and result from your “My Diigo library” and Diigo community library on the right.
Number Gossip is an outstanding math tool that I learned about from the excellent blog ZarcoEnglish-Tool of the Day. Number Gossip is a search engine for numbers only. Type in any number and you will learn "everything you wanted to know about it but were afraid to ask". For example, when I search for the number 2 I learn: 2 is the smallest prime number, 2 is the only even prime number, the smallest field has 2 elements, for any polyhedron, 2 is the number of vertices plus the number of faces minus the number of edges. I can also learn the rare properties of two, and the common properties of two. Now that is pretty cool!
Students of the past spent most of their academic time in the library, pouring over encyclopedias, and sifting through pages of data. It's easy to get lost in a text-heavy reference book, amidst numbers and figures; this is especially true for science majors, whose art and skill revolves around specific numbers and very precise information. Fortunately for today's scientist, much of the information that was once found only inside the walls of a library is now available online. These awesome science search engines will help you find what exactly what you're looking for, as well as remind you how much fun research can really be.
I hadn't thought of showing search engine results from different countries instead of searching for articles from different countries. Note the .cn in the url on the left.
" The answer to almost any question is available within seconds, courtesy of the invention that has altered how we discover knowledge - the search engine. Materializing answers from the air turns out to be the easy part - the part a machine can do. The real difficulty kicks in when you click down into your search results. At that point, it's up to you to sort the accurate bits from the misinfo, disinfo, spam, scams, urban legends, and hoaxes. "Crap detection," as Hemingway called it half a century ago, is more important than ever before, now that the automation of crapcasting has generated its own word: "spamming.""
I like this one for kid useability, but don't like that it doesn't really explain WHY it selects the appropriate tools that it does. Oh well, efficient.