Science Resources:
Chemguide: Explains chemistry terms and concepts.
Explore.org: Watch livestream and recorded videos of wildlife or look at over 300,000 natural photographs.
Nasa: Go on a journey into space.
PhET interactive simulators: Discover and learn about math and science through a game-like environment on math, earth science, chemistry, biology, physics....
Physics Classroom: Explains physics terms and concepts with simulations, tutorials and more. It also covers a bit of chemistry.