Hosted by the University of Oxford, Our World in Data explains global issues using interactive graphs. This page on their site has slide presentations on five topics including extreme poverty and population growth. They can either be downloaded in Powerpoint format, or viewed online: in the latter case, the included graphs are fully interactive, allowing the reader to jump back and forth along a timeline, for example.
Lecture Slides in Economic History
This course web page includes links to antitrust web material, assignments and PowerPoint slides (in .pdf) on the topics of: biological living standards, measuring economic welfare, the second great migration, technology and the economy, and ten points of "Time on the Cross". This link is to Archive.org's copy of the site.
Part of Brad DeLong's blog, this section supports a 2009 version of a course on economic history as taught at the University of California at Berkeley. The material includes lecture slides and notes, mp3 audio files of lectures, exam papers, problem sets, plus links to background information available freely online. Information is accessible chronologically, by subject category and by type.