Here are some miscellaneous science activities, videos and games.
Lawrence Hall of Science
http://www.lawrencehallofscience.org/kidsite/
Mr. Young's Bouncy "A"
http://covenantworks.com/Bouncy-A/Science/index.htm
Science Bob
http://www.sciencebob.com/index.php
Catch the Science Bug
http://www.sciencebug.org/index.html
Dragonfly TV @ PBS Kids Go
http://pbskids.org/dragonflytv/index.html
Bill Nye the Science Guy
http://www.billnye.com
Amusement Park Physics
http://www.learner.org/interactives/parkphysics/index.html
How Stuff Works
http://www.howstuffworks.com
Science Illustrated
http://scienceillustrated.com.au/blog/
National Geographic Explorer
http://magma.nationalgeographic.com/ngexplorer/index.html
PhET Simulations
http://phet.colorado.edu/en/simulations/category/by-level/elementary-school
Steve Spangler You Tube videos
http://www.youtube.com/SpanglerScienceTV
100 Coolest Science Videos on YouTube
http://www.x-raytechnicianschools.org/100-coolest-science-experiments-on-youtube/
Mr. Parr Science Videos
http://www.youtube.com/results?search_query=mr.+parr&oq=mr.+parr&gs_l=youtube.3..0l10.1070.3132.0.3291.8.8.0.0.0.0.107.784.5j3.8.0...0.0...1ac.ANk-Qwr7u0g
http://www.lawrencehallofscience.org/kidsite/
Mr. Young's Bouncy "A"
http://covenantworks.com/Bouncy-A/Science/index.htm
Science Bob
http://www.sciencebob.com/index.php
Catch the Science Bug
http://www.sciencebug.org/index.html
Dragonfly TV @ PBS Kids Go
http://pbskids.org/dragonflytv/index.html
Bill Nye the Science Guy
http://www.billnye.com
Amusement Park Physics
http://www.learner.org/interactives/parkphysics/index.html
How Stuff Works
http://www.howstuffworks.com
Science Illustrated
http://scienceillustrated.com.au/blog/
National Geographic Explorer
http://magma.nationalgeographic.com/ngexplorer/index.html
PhET Simulations
http://phet.colorado.edu/en/simulations/category/by-level/elementary-school
Steve Spangler You Tube videos
http://www.youtube.com/SpanglerScienceTV
100 Coolest Science Videos on YouTube
http://www.x-raytechnicianschools.org/100-coolest-science-experiments-on-youtube/
Mr. Parr Science Videos
http://www.youtube.com/results?search_query=mr.+parr&oq=mr.+parr&gs_l=youtube.3..0l10.1070.3132.0.3291.8.8.0.0.0.0.107.784.5j3.8.0...0.0...1ac.ANk-Qwr7u0g