The link for the Arduino comic on the foundation page is bad. Instead of the comic, it links to some authentication portal.
Thanks for your report @mcandre. I have submitted a fix to the documentation content. Until that is published, you can access the Arduino Comic here:
For what it's worth, I couldn't find a link to the comic at that URL, but did find that it's available here on a similar page:
Thanks for pointing that out. It seems those links were missed when it was transferred from the Arduino Playground to the tutorial. I have submitted a fix for that one as well.
Thanks for the rapid response