I was thinking of how to explain to them why what I do is hard enough to justify an education and that money they hear so much about. And I started wondering... if you could add up all of the person-hours spent on the processes invoked when you viewed this web page... from the web-browser and network connection you're using down to the silicon itself... how would that compare to the person-hours spent preparing for the invasion of Normandy, which I believe is still the largest military exercise ever (correction invited).