site says. I watched the 12-min. explanation of how it works (here) and was pretty amazed. In addition to serious help with math, physics, chemistry, etc. calculations, it also helps with questions around biology, geology, geography, astronomy, and history. A couple of examples in the latter group: the gray wolf’s kingdom, phylum, class, order, genus, and species and the nutritional value of a mocha latte (lots more examples here ). Nothing ambitious about all this: The knowledge engine “aims to make the world’s collective knowledge more accessible and useable.” Check it out.