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"This extension adds 4 themes to your gallery with more than 400 cliparts dealing with security at work. Better than bitmap, cliparts are vector graphics in ODF format: there is no lost of clarity when magnifying. In Draw, you may modify them or retrieve some parts to build your own signs"

Extensive science animated tutorials. Check out "Science in Focus" tab for animated tutorials on current events.

Nice collection of colourful clipart for science teachers, shared under a creative commons licence.