Pakistan has about 2 percent of the world's population living on less than 0.7 percent of the world's land.

Q: What portion of the world's population lives in areas affected by the earthquake? How can you tell? How many of those are under age 18?

Show your work.

Extra credit: What is the population density in the most severely affected areas?

ALSO, there is a fascinating piece by an Indian seismologist, Arun Bapat, about what is to be learned from this earthquake tragedy, including some risk factors to that population your trying to do math about that might not have occurred to you:

. . . let us examine the fate of conventional structures. Press reports and television coverage indicate that there has been extensive damage in the mountainous areas of this region. The area in the vicinity of earthquake epicentre is situated at an altitude of 2,000 to 3,000 meters. Seismic vibrations have more amplitude at higher elevations. For example, take a 30-storeyed building. It will have the least vibrations at the level of the ground floor but, as you go higher, the amplitude of the vibrations increase. The earthquake damage in Baramulla, Uri, Poonch, and so on, which are located at heights of about 1,500 to 2000 metres, and at a distance of about 60 to 90 km from the epicentre, was therefore more severe, as compared to the damage at Islamabad or Haripur, which are at a distance of about 60 to 90 km, but situated at an elevation of about 500 metres or so.

Follow the link to the Indian Express news story, "Is there anybody out there?" It is the first one I've seen to give any account of what I've suspected was going on in the quake-ravaged hills.

Even in the fuzzy Digital Globe satellite images from 1999 -- the best I could get of the region over the internet -- it is apparent on my nice large monitor that the mountainsides are terraced with farmlands, and their creases are dotted with small white rectangles suggestive of roofs. There were people down there.