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 Metal roofs cost anywhere from $3 per square foot to $20 per square foot or more (or $4,500 to $30,000 for a 1,500 square foot roof). 2  Aluminum roofing costs $6 to $12 per square foot ($9,000 to $18,000).  Steel roofing costs $3 to $10 per square foot ($4,500 to $15,000).