Word: layers
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FURNACES: Cleaning a furnace once a year costs about $50 and is well worth it. A layer of soot just one-fiftieth of an inch thick can reduce an oil burner's efficiency by 50%. Radiators should be dusted regularly...
...Science Museum is on top of it. The dam lets sea water leak into the Charles Basin, where it settles to the bottom because it is denser than fresh water, slowing down the water's circulation and helping to stratify the Basin. "Eventually," Noss said, "there's a layer so dense that normal river current just flows over it and it's not freshened, so to speak, by the fresh water...
Independents appear to be split on this issue. Some, like Donald A. Fantini, contend that the city manager effectively serves as the civilian head of the police department and that the creation of the new post would only add another layer of bureaucracy...
Excavating steadily for the past five summers in Koster's cornfield, which is 45 miles north of St. Louis, Struever's team has dug up the remnants of at least 15 separate prehistoric settlements. Stacked atop each other in easily distinguishable layers-or horizons, as archaeologists call them-the individual settlements were in remarkably good condition. They had been so well preserved by covers of protective dust, which blew down from nearby bluffs after they were abandoned, that they can be "read" by archaeologists like pages of a history book. The oldest layer dates back some...
...Missouri report that it may be time to take them literally. Using ground-up newspapers to filter water containing algae, Richard Spray, Neil Meador and Donald Brooker found that the newsprint effectively trapped the single-celled plants, which are rich in protein. After a while, such a thick layer of algae built up on the newsprint that it had a higher content of crude protein than dried beef, soybean meal or skimmed-milk powder. Though the Missouri scientists do not suggest that their old-newsprint disposal scheme could ever fill human food needs, it could provide a useful high-protein...