protonormal

Or you're a Mac OS or iOS user and the scrollbar will be invisible when you're not scrolling.

Call it Stasi-Email

I'm a big fan of the concept, but this is hardly new (although the interactive graphs are great)

For anyone who wants something like this, check out the IPython notebook and Sage:

http://ipython.org/ http://sagemath.org/

"We thought about this years ago we have done tons of user interface testing on this and it turns out it doesn't work" Steve Jobs - Back to the Mac 2010

http://www.youtube.com/watch?list=ULZmlH59yKpqY&v=ZmlH59...

Definitely. There is a project at the FU Berlin. [Saros - Distributed Collaborative Editing and Distributed Party Programming](http://www.saros-project.org/) It's based on the Eclipse platform and XMPP.