This has a wealth of natural science information. "Sponsored in part by the Interagency Education Research Initiative, the Homeland Foundation and the University of Michigan Museum of Zoology. This material is based upon work supported by the National Science Foundation."

"The Tree of Life Web Project (ToL) is a collaborative effort of biologists and nature enthusiasts from around the world. On more than 10,000 World Wide Web pages, the project provides information about biodiversity, the characteristics of different groups of organisms, and their evolutionary history (phylogeny)." Each page contains information about a particular group, e.g., salamanders, segmented worms, phlox flowers, tyrannosaurs, euglenids, Heliconius butterflies, club fungi, or the vampire squid. ToL pages are linked one to another hierarchically, in the form of the evolutionary tree of life. Starting with the root of all Life on Earth and moving out along diverging branches to individual species, the structure of the ToL project thus illustrates the genetic connections between all living things." This looks like an outstanding natural science collaborative resource!

8 interactive tutorials related to microscopy. No audio but some really great visuals!

Excellent collection of animations about cellular processes

Display changes as you roll over each element. Click and a window opens displaying the Wikipedia entry for that element.

Go into different rooms and find the simple machines

Speaker with a wonderful flair for making complex science understandable.

Interactive star map and virtual sky

Extensive resource on all things physics from middle school through college.

Five lessons about maps and globes

ezine about particle physics