Ah...the familiar PowerPoint. The linear nature of PowerPoint slides make them a suitable way to present a timeline about a topic, issue, or series of events. Each slide can be made to represent a specific event, or point on your timeline.
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You can use the online version of PowerPoint by signing into your campus email, and accessing the app launcher 'waffle" in the upper left of your screen. https://www.csuohio.edu/sites/default/files/access_apps.pdf
Collaborating: Easily share a PowerPoint with other editors using the 'Share' function in the online version.
Sway is a relatively new presentation + digital storytelling tool from Microsoft. It is also linear, but allows for more kinds of content to be inserted and embedded. It also relies on the concept of 'sections' rather than slides.
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Access Sway as a Microsoft app through your campus email.
Collaborating: Easily share a Sway with other editors using the 'Share' function in the online version.
Timeline.js is a free web tool developed by the Knight Lab at Northwestern University. It takes information from a user created Google Sheet (with rows for each point on the timeline) and uses that to represent points on an interactive timeline with proper scaling of days, months, and years. it can be viewed from a link, or embedded on a webpage.
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Collaborating: You'll need to share the spreadsheet which feeds into the Timeline tool with other editors.
It's important when you look for material to put in your project that you consider the copyright status of that work. Even if something is freely shared on the internet, it doesn't mean that content can be copied and shared freely without violating copyright. There are two kinds of works you should focus on in your searching that allow for straightforward reuse:
See the Understanding Copyright tab to learn more about Creative Commons and public domain.