5000 Collegiate Words with Brief Definitions
The 5000 words below, with brief definitions, are free for individual and classroom use. These words are also downloadable from Texas Instruments in a format for some Texas Instruments calculators. A 36 page, small-print, two-column PDF version ....
http://www.freevocabulary.com/

A Cure for Kids' Summer Reading Doldrums
"...Not every school has a single book an entire class must read before the fall. Some have a list of authorized books from which students must pick a requisite number.."
http://www.npr.org/templates/story/story.php?storyId=4695837

Abacus
The standard abacus can be used to perform addition, subtraction, division and multiplication; the abacus can also be used to extract square-roots and cubic roots
http://www.ee.ryerson.ca:8080/~elf/abacus/

Acronym Search
Acronym Search
http://acronymsearch.com/

ACT
College Testing When You Are Ready!
http://www.actstudent.org/

Agriculture
National Agricultural Library: Kid's Science Page
Agriculture in the United States is "growing" more high tech every day. More and more, we're operating sophisticated high speed equipment; satellites, computers, software and sensors, to produce the..
http://www.nal.usda.gov/Kids/

Algebra
The Language of Algebra
The Basics of Algebra
Equations and Inequalities
Graphing Equations and Inequalities
and More~
http://math.com/homeworkhelp/Algebra.html

Algebra Help
Algebra Help
http://www.edhelper.com/algebra.htm

Algorithms for Egyptian Fractions
When we use fractional numbers today, there are two ways we usually represent them: as fractions (ratios of integers) such as 5/6, and as decimal numbers such as 0.8333
http://www.ics.uci.edu/~eppstein/numth/egypt/intro.html

American Heritage Dictionary
American Heritage Dictionary
http://www.bartleby.com/61/