This document provides an overview and demonstration of the Expernova search engine and database. It discusses:
1. The theoretical background of Expernova, including the needs it addresses, its solution, and new features in Version 4.
2. A demonstration of how to use the Expernova search engine, following "golden rules" to construct effective searches.
3. Examples of different search modes and new intelligent analysis features to help users understand and make use of search results.