Instead of being smooth and nearly featureless like a kidney or spleen, the cerebral cortex (the thin layer of gray matter forming the outer surface of the brain) is chock-full of wrinkles and folds.Click on the image above for a larger view.nstead of being smooth and nearly featureless like a kidney or spleen, the cerebral cortex (the thin layer of gray matter forming the outer surface of the brain) is chock-full of wrinkles and folds.
Depending on the type of your roof, geographic location, and the company or weekend warrior you choose to hire, the total installed cost of a composition shingles roof could vary between $2.75 to $7.50 per square foot installed.
1 Built-up roofing costs $3.50 to $7.00 per square foot installed. 2  Masonry roofs typically cost $2 to $4 per square foot installed, but can be slightly more expensive depending on the price of concrete at the time of installation.3  Flat metal roofs cost $5 to $15 per square foot installed. Masonry roofs typically cost $2 to $4 per square foot installed, but can be slightly more expensive depending on the price of concrete at the time of installation. 2  Flat metal roofs cost $5 to $15 per square foot installed.