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Re:Show HN: A stupid simple note app by Wingman4l7 on Friday February 01, 2013 @12:27AM (#5149368)
That would be http://research.microsoft.com/en-us/um/redmond/projects/asir...

There is also one where you assemble a puzzle: https://www.keycaptcha.com/

They have varying levels of handicapped accessibility though.

Re:Show HN: A stupid simple note app by skylarsch on Friday February 01, 2013 @12:36AM (#5149401)
Thanks. Honestly I'm not that concerned about it. If there is a sudden mysterious spike in traffic I may look into it.