Good question. For that matter, why would a company want to block internet access to its employees? In our case I believe it was just the default setting and nobody thought to check. All I'm saying is, let's think twice before DDoS-ing Yemen's Websense servers in the name of freedom.

I think this is configurable. When all the Websense licences are in use at my office, all requests get blocked.

I am a designer for a large gas turbine engine manufacturer, and I have to agree that there is still a lot that we just don't understand well enough or can't model adequately. Combustion noise, liquid atomization, fatigue/creep interaction, etc. We do all kinds of FEA and CFD analysis, but still spend tens of millions of dollars on testing to back up those simulations.