Online presentations on more than 150 health topics, diseases, and conditions, from acne to viruses. Each plays as a slide presentation, with sound, that you can control or set to autoplay. Time varies from 5-20 minutes. Available in...

This in-depth site provides middle and high school science teachers with a wide array of free instructional resources, such as slide sets, streaming video presentations, and laboratory activities. Information is provided that is...

Focuses on the history of costumes and fashion from Egyptian times to the 1990s. Thumbnail links may no longer work as this is an older site. However, the 'Fads in Fashion Slides' page has many large images organized by time periods....

This site presents a pictorial timeline of technology developments.