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I watch Riley paging through the book Diggers, a string of drool swaying gently from his chin. Here is the Big Muskie, the biggest shovel ever made (a bus sits in the blade), the trencher, the mole power that dug the Chunnel. "Mama, read it!" he commands. We start over, examining each picture in detail, and I realize again how much I am enjoying myself. would never have spontaneously decided to research construction vehicles. But here I am now, able to inform unenlightened acquaintances about the difference between backhoes and bulldozers. I perk up when I pass a construction site, even if Riley is not with me. It''s so much fun that I hope I''ll be able to let it go when he does -- when his interest turns to, say, weaponry, as everyone assures me it will. I can see myself, birthday after birthday, giving him the latest innovation in construction machinery toys, while a teenaged Riley, too shy to point out that he is now into tax law, accepts them politely and without enthusiasm.

Now, a relatively new technology shows promise of adding an element of certainty to an otherwise uncertain rescue.Downed firefightersOrange County (Fla.) Fire and Rescue has completed initial field tests of a Global Positioning System - based rapid-deployment, in-building personnel geo-location and tracking system for use by firefighters on the fireground. The system is designed by MeshNetworks of Maitland, Fla., a mobile broadband networking firm, with systems integration assistance from IBM.This Mesh Enable Architecture system, a spin-off of the company''s sophisticated military battlefield geo-location solution, employs three or four routers mounted on 6-foot tripods positioned around the burning building. Once the routers obtain their exact latitude and longitude via GPS, they are able to perform wireless radio triangulation to fix the location of any firefighter within the perimeter who''s equipped with a cell phone - sized transponder device.

Molten pig iron is a relatively impure alloy of iron, with about 4 percent carbon and other materials. It is used hand chiefly as a primary ingredient of steel, but is also used for many finished products such as pipe fittings and structural castings. However, these products are rarely made directly from blast furnace iron. In most cases, the cold pig iron is re-melted in brick or refractory lined cupolas or malleable iron furnaces. In these lined furnaces the quality and analysis of the iron can be more accurately adjusted and controlled, before casting the metal into final form.