Concrete is a mixture of cement, water, sand, gravel, crushed rock, or other aggregates. Sometimes, one or more admixtures are added to change certain characteristics of the concrete, such as workability, durability, and time of hardening.
Top 100 Colleges by Highest Tuition. Here are the top 100 most expensive colleges by tuition for the 2008-2009 school year. The latest numbers can be found in our most expensive colleges ranking. Notes: Some colleges like Bates College, Colby College, Middlebury College, and Union College have a comprehensive fee (tuition + room/board).
Best Answer: Duke Medical school has always been in the top 5 in the country and is the most reputable one among its professional schools. Duke is also known for its English and Public Policy departments. On the other hand, the engineering and science have improved over the years, but not considered top-rate. Also it has a higher ranking for its undergraduate (peaked at No. 3 in 1997 and steady at No. 5-8 recently) than grad school.