http://www.physicsclassroom.com/

The Physics Classroom

Video about a huge dinosaur bed discovered in
Pipestone Creek (Canada)

http://www.riverofdeath.ca/

helps teach his student
how to use a compound light microscope.

http://www.udel.edu/biology/ketcham/microscope/scope.html

 

Strange Matter
is a traveling exhibition developed by the Ontario Science Centre.  This is fun site!

http://www.strangematterexhibit.com/

The Little Shop of Physics has online experiments demonstrations and more.

http://littleshop.physics.colostate.edu/index.htm

Some of these animations make a lot of science crystal clear! 
You'll find all sorts of Flash movies categorized into areas such as
microbiology, animals, and physics.
http://science.nhmccd.edu/biol/animatio.htm

Teach 21st century math and science concepts to middle school and high school students using original, immersive science simulations provided by Technology Enhanced Learning in Science (TELS). The curricula feature compelling graphics, unique, controllable models, and week-long, inquiry-based projects. Registration is free

http://www.telscenter.org/curricula/index.html