This document provides a lesson on searching PubMed for scientific research. It explains that while Google and Google Scholar can find some PubMed citations, they do not comprehensively search the full biomedical literature like PubMed does. The document then demonstrates how to perform various types of searches on PubMed, including keyword searches, searching with limits, author searches, and citation searches. It also shows how to combine search terms and use field tags to focus searches more precisely. The goal is to teach researchers how to effectively search the biomedical literature using PubMed's advanced search features.