high school
World Maths Day 2010
The annual free online math competition is back! World Maths Day is an international competition open to all children from age 5 to 18, and is a great way to get competition-oriented kids to work their math skills.
The official competition is during a 48 hour period that includes March 3 worldwide, but kids can play head-to-head with children from all over the world anytime.
A description of the contest from the official website:
Mathalicious
A website dedicated to the idea that math is best learned when it is used as a tool to learn about something else. Covers Middle school math and algebra 1 and 2. Be sure to read the lessons thoroughly, some subjects may be inappropriate for sensitive or young kids.
The Periodic Table of Videos
A collection of funny, informative videos about each of the elements of the periodic table. Produced by the University of Nottingham. One of those wonderful sites that has a little something for everyone, from early elementary aged kids through adults. (To visit the site, click on the thumbnail above.)
Abraham Lincoln's Crossroads
A free, interactive "game" where kids listen to a virtual Lincoln describing pivotal moments in his life, and then have the opportunity to guess which choice Lincoln made. An interesting presentation of a lot information about Lincoln's life and times. Appropriate for middle school level and beyond.
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Creativity Resources from the Denver Art Museum
Lesson plans for Early Childhood, Elementary and Secondary levels. Each focuses on a particular piece of art, and includes a full page photo of the art piece in question, allowing you to do the lesson at home. There is also a database of the museum's art work, searchable by country/culture of origin, medium, period and continent of origin.
Community College Open Textbook Collaborative
An organization to make quality "open textbooks" available for Community college use. The website includes free or very inexpensive textbooks on a wide range of advanced topics.
Skewer Hyperboloid
Simple instructions for making a 3-D hyperboloid from skewers and small rubberbands.
Food timeline
A timeline showing when and where various foods were invented with lots of informative links.
Online Electronic Circuit Simulator
This free online tool requires java. It will let you see how voltage and current change in a range of circuits as you alter the components.