Enthusiast Jenny Eather is the creator of an unique online resource for grade school mathematics students. Called A Maths Dictionary for Kids, the site has over 400 entries arranged alphabetically that explain key math terms and concepts in a simple, straightforward manner. Besides giving definitions, each topic has an interactive activity that demonstrates its use and significance. Some of the...

The National Institute of Standards and Technology has recently updated its online Dictionary of Algorithms, Data Structures and Problems. The dictionary takes the form of a hypertext alphabetical list of terms dealing with algorithmic techniques and functions (e.g., Ackermann's Function), data structures, archetypical problems (e.g., "traveling salesman"), and related definitions. Nice features...