[NAEP] 1 for math, 1 for science

[Dawn Wiseman]

National Library of Virtual Manipulatives
http://enlvm.usu.edu/ma/nav/doc/intro.jsp
Learning about various branches of mathematics can be tough at any 
age, and this fine set of resources created by staff members who are 
primarily based at the Utah State University is designed to make this 
process just a bit easier. With substantial funding from the National 
Science Foundation, they have successfully developed a large set of 
interactive online learning units that deal with topics such as 
geometry, arithmetic, and trigonometry. First-time visitors may want 
to begin by looking over the "About" section, which includes a 
tutorial designed for educators who wish to use the materials as well 
as another tutorial that will teach educators how to create lessons 
and activities. Delving into the learning materials at the site, 
visitors can browse through the learning modules by subject or grade 
level. Visitors can also browse teacher published lessons, all of 
which have been vetted by staff members at the National Library. 
Finally, visitors will want to definitely look over the virtual 
manipulatives library, which includes instructional materials that 
students will find quite engaging.

Chem1 Virtual Textbook [pdf]
http://www.chem1.com/acad/webtext/virtualtextbook.html
Chemistry serves as a fundamental discipline for those who will go on 
to careers in everything from medicine to nutrition and it is 
important for students of this science to have a wide range of 
resources at their disposal. One rather useful online resource is 
this virtual textbook for general chemistry created and updated by 
Professor Stephen Lower of Simon Fraser University. Visitors to the 
site can dive right in by reading an introduction titled "What is 
Chemistry all about, anyway?", and then proceed through a very 
well-structured set of chapters dedicated to the basics of atoms, 
equations, chemical energetics and other topics that would be 
typically covered in such a course. The site is rounded out by a good 
set of links to related interactive chemistry tutorials and exercises.