DTE

3D modeling software such as Rhinoceros (http://www.rhino3d.com/) uses this model with great success and I'm sure there are others. The program has a GUI that is very modular and customizable but the command-line interface is the primary interface. It takes a short while to get used to but after you do it scales very well as your experience grows. I have thought for a while that Photoshop/Illustrator would do well with a CLI but this is a compelling case for a contextual but system-wide implementation of this concept. The closest we have is Quicksilver or Alfred and while they are indispensable, making this part of the OS would open up some interesting possibilities.

The feds were worried a long time ago but full disk encryption (or any encryption really) was not adopted by the public. The barrier to entry was too high. Only now is this odd relationship (encryption is ok but only when it isn't commonly used) going to have to play out in our legal system and culture, and it will be super interesting to see how we decide as a society what the limits of this technology are.

See: http://www.wired.com/wired/archive/1.02/crypto.rebels_pr.htm...

I just did exactly this...Ryan is a great asset to the ruby/rails community and I am happy to support his continued involvement.

Seems like a whole lot of technology solving a problem I don't think many people have.

The idea of presenting calculus visually is certainly a good one, but this is useless for anyone other than the author. The point of illustrations is to enhance the material and this is just plain unreadable.

Here is an interesting project that is far more successful at math illustration and shows some promise:

http://worrydream.com/KillMath/

Absolutely. And are there any significant efforts or new ideas for dealing with this problem?

I'm sure this has been worked out by the team, but I am curious to know more about the load-bearing nature of the concrete shell. I would imagine this is a very important consideration if it is to be used in post-disaster areas (i.e earthquake disaster areas where there may also be aftershocks). If, for example, the tent is not fully inflated before the concrete is added, would the hardened building be structurally compromised?