Regarding your siren location web material, there is some work in this area that may be of interest:
Current, John and Morton O'Kelly. 1992. "Locating emergency warning sirens." Decision Sciences, 23, 221-234.
Murray, Alan T. and Morton E. O'Kelly. 2002. "Assessing representation error in point-based coverage modeling." Journal of Geographical Systems,
4, 171-191.
Alan Murray

From Marc Schlossberg:

...I have 2 web sites for you:

1. - this is a geographic-based query and some mapping) of campaign contributions.
2. - you MUST download the trial software of this !!!!!  3D global, high resolution exploration of the entire earth.  Expect to waste
every minute of the 7 day trial playing with this program and showing it to others.  If you haven't seen it, you have to check it out !

Quoting "Antonakos, Cathy (Ann Arbor)" <>:

Sandy, I heard the sirens last night. I had taken a look at your siren map (Solstice?) and realized I was previously in a spot where they could not be heard! Lo and behold, I was thinking of you and John last night, and how much I have appreciated both of you -- how much I have learned from you.  I am so much more fortunate than others who have not had such good mentors. And then -- the sirens went off!! I thought you would like to know that not only did your study provide evidence that they could be heard, but now an Ann Arbor resident is saying so!

Quoting Frank Witlox:

By the way, I very much liked your paper on the Christaller networks (the spatial synthesis sampler). It is always difficult to explain to students how the k=3, k=4 and especially k=7 works. Now I have the solution: point to your paper in Solstice.

idle thinking:  "snail mail" = "escargot-to-go" [ed.]