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Catter
What is going on in trailhead today - logged in to find a new Catter trail - very weird and whats worse doesn't seem to be added to my developer instance so cannot even work through it...
I believe this will clear things up.
https://developer.salesforce.com/blogs/developer-relations/2015/04/introducing-catter-connect-cat-like-never.html
Take note of the month and day