Question: Is there a computational knowledge engine that can provide answers and insights across multiple subjects, including history, geography, and linguistics?

If you're looking for a broad computational knowledge engine that can give you answers and explanations in many subjects, including history, geography and linguistics, Wolfram|Alpha is a great option. It has a deep level of expertise in subjects like math, science, society and culture. Wolfram|Alpha can answer a broad range of questions, from solving math problems to explaining historical and linguistic phenomena, and is useful for both personal and professional use.

Another top contender is Wolfram, which packages algorithms, data, notebooks and linguistics into one service. It's geared for heavy-duty work in R&D, education and data science, with tools like Mathematica for technical calculations and Wolfram|Alpha Notebook Edition for interactive documents. The service offers a free trial and abundant documentation to help you get the most out of it.

If you prefer an AI-based approach, Epsilon is an AI search engine that helps scientists accelerate discovery by finding relevant citations, summarizing information and synthesizing results. It offers tools like Investigate for summarized answers, Search for indexed publications and Validate for assessing claims. Epsilon is used by more than 30,000 researchers and offers a variety of pricing levels depending on your needs.

Last, Semantic Scholar is a free AI-powered research service that lets scholars search for and read relevant scientific papers in a database of more than 219 million papers. It offers powerful searches with filters, short summaries (TLDRs) and AI-powered research feeds. Semantic Scholar is great for researchers and developers looking for a broad, free service to keep up with the latest research in their field.