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).
Located in Cambridge, Massachusetts, this Ivy League school is in close-proximity to the hundreds of thousands of college students in the greater Boston area. Low achieving students need not apply -- Harvard has the lowest acceptance rate of any U.S. university. It should come as little surprise that Harvard made my lists of Top National Universities, The 20 Most Selective Colleges, Top New England Colleges, Top Massachusetts Colleges, and even Best Engineering Programs.