ChemSpider and Internet Based Chemistry -- Discussions This presentation was a presentation to a group of chemistry students at Drexel University. The premise of this presentation was an overview of the ChemSpider search engine and database but during the process of teaching about ChemSpider an overview of various aspects of internet based chemistry were given. This included: the quality of chemistry-related data online, an overview of InChIs as a basis for searching the internet by chemical structure and semantic markup of chemistry articles.