I’m a fan of XKCD and the other day he ran a comic based on a calculation of the likelyhood someone is having sex within X distance of you. I couldn’t resist, and ran the numbers for D.C. With a population of 591,833 (as of 7/1/08 according to the census bureau) and a size of 61.4 square miles of land, that’s 9232 people per square mile. Punching that into Randall’s formula and letting Google handle the units works out like this:
sqrt(2/(pi*(9232/mi^2)*(80/year)(30 minutes))) = someone is gettin busy within
197.836832 meters of you right now.
Of course that’s just residency numbers. There’s over a million people in the city during the workday, so you might not want to look to see what that noise is in the next cubicle.
Okay it just changes the result to 152m, but that was funny, dammit!