dead youtube link on prototype page

[jakeymumfie]

In the first annotation, "Watch the demo and prepare to be blown away" links to a youtube account that has been deleted.

[Jervelund]

I spotted this as well - Guessing the link would have contained a video of Ivan Sutherland demoing Sketchpad. These could be substitutes:

Ivan Sutherland Sketchpad Demo Ivan Sutherland Sketch Pad Demo - Short version

[nosarthur]

I was ready to be blown away 😞