Watch hundreds of animated explanations, interactive tutorials and instructional videos and Explania.com !  They can also be embedded into your own website.

http://www.explania.com/en

Here is an example …. (click on the image to start the animation)

The Human Heart – Explania

Appropriate Technology is used to solve technological problems throughout the world, by providing sustainable solutions that are beneficial to the local community……

(more…)

Scienceblog.org  is my own portal for science students and teachers.

It brings articles and other resources for students and teachers following 21st Century Science.