Word: layering
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...both the mujahideen and Taliban eras to average Afghani citizens of nearly every tribe and creed. Her book becomes more than an excellent political history; it is also a people’s history, interwoven with stories of normal Afghani people literally caught in the crossfire that add a layer of complexity to oft-cited terrorist stereotypes. From the very first chapter, Gannon’s thesis is clear: The failure of Afghanistan is the failure of West. She accuses Western governments—and the United States in particular—of driving Afghanistan into chaos by permitting...
...tinkering with the innards. President Bill Clinton showed his lack of interest by assigning the subject to Vice President Al Gore. And now there is Romney, who told the Journal that--depending on the data, of course, and whatever McKinsey recommends--he would create a layer of "super-Cabinet" positions so that the President doesn't have "30 direct reports...
Neuroscientists have known for a while that kids' brains are programmed to do the wave. The cortex, or outer layer of gray matter--which is responsible for such things as planning movement and suppressing inappropriate thoughts or actions--thickens from back to front during childhood and then thins out in adolescence, as unused neural connections go the way of football fans' empty beer cups. Thanks to nifty imaging techniques, the point at which the cortex reaches peak thickness is now recognized as an early milestone in brain maturation. But in a surprising new study, kids with attention-deficit/hyperactivity disorder...
...nearly 30 years ago that physicist Luis Alvarez and his son Walter, a geologist, proposed the giant-impact theory of dinosaur extinction. Their evidence was compelling: a thin layer of iridium in the earth's sediment dating to about the time of the die-off. Iridium is rare on Earth but common in asteroids. The iridium layer, mapped by the Alvarezes in scattered sites around the world, suggested an asteroid that vaporized on impact, spreading a cloud throughout the stratosphere. The argument seemed sealed in the 1990s, when geologists realized that a huge crater centered near Chicxulub, Mexico, was almost...
...shallow, with a soil depth of less than 8 in. (20 cm), able to support smaller plants. The intensive type may be smaller, but it's deeper and home to larger plants. Whatever the design, green roofs are a lot more complicated than ordinary gardens. They have multiple layers beneath the soil, including a filter membrane, a drainage layer, waterproofing, insulation and structural support...