Science

Animal Diversity
http://animaldiversity.org/
From the University of Michigan Museum of Zoology, the Animal Diversity Web is an online database of animal natural history, distribution, classification and conservation biology. Students can browse the information on individual creatures from the Kingdom Animalia and find thousands of pictures on specific animals.
 
Ace on the Case:Secrets@sea
http://www.secretsatsea.org/
An interactive adventure that helps students learn about marine ecology.  Grades 4-7
 
Zoom:Kitchen Chemistry
http://pbskids.org/zoom/kitchenchemistry/
Visit the virtual kitchen to perform online experiments, solve a puzzle, and get a reward.  Grades 4-6
 
Catch the Science Bug 
http://www.sciencebug.org/index.html
The educational goals of Catch the Science Bug are to increase science literacy and raise environmental consciousness by adhering to national standards and guidelines for content, to use different teaching methods for engaging all types of learners, and to encourage life-long learning by featuring scientists who model this behavior.
 
Cool Science for Kids
http://www.hhmi.org/coolscience
Cool Science is a fun site that helps students appreciate science. Covers observation skills, plants, animal classifications and metamorphosis. Grades K-3
 
Cells Alive
http://www.cellsalive.com/
CELLS Alive! represents 30 years of capturing film and computer-enhanced images of living cells and organisms for education and medical research. The site has been available continuously and updated annually since May of 1994 by Jim Sullivan, and now hosts over four million visitors a year.

The Great Plant Escape
http://www.urbanext.uiuc.edu/gpe/
Help Detective Leplant and his partners investigate plant mysteries including cases about soil, plant growth, seeds, and reproduction. Grades 4-5
  
Entomology Image Gallery
http://www.ent.iastate.edu/imagegallery/
View images and movies of beetles, ticks, lice, and lots of other creepy crawling insects!  Grades 3 and up
 
Popular Science
http://www.popsci.com
There are plenty of interesting things to read at Popular Science Magazine's web site. Articles on science, space, the Internet, computers, and more.  Grades 3+
 
The Astronomy Workshop
http://janus.astro.umd.edu/index.html
Students can view a multitude of Java programs that creates a solar system, view the moons and their orbits around their planets, and learn about astronomical distances.  Grades 3+
 
Galaxy Hunter
http://amazing-space.stsci.edu/resources/explorations/ghunter/
Statistically speaking, this cosmic photo shoot is out of this world!  Students construct and interpret frequency tables, demonstrate knowledge of simple random samples, define range, mean and median as they apply to statistics, and demonstrate knowledge of min/max plots.  Teacher Tips included.  Grades 10-12
 
Funology
http://www.funology.com
At Funology find fun facts, experiments, crafts, recipes, magic tricks, jokes, and a whole lot more.  Grades 2-5
 
Science Bob
https://sciencebob.com/
Science Bob is a fun, interactive site that has several different areas for kids to choose from. There are videos, experiments, science fair ideas and a research help link with many fantastic links to other sites.
 
Science Monster
http://www.sciencemonster.com
Created by the makers of CoolMath, this site entertains with information about our solar system.  Students can take a star tour, see how gravity and inertia work, and play a fun lunar landing game. Grades 2-5
  
The Physics Classroom
http://www.physicsclassroom.com/
An online physics tutorial written for high school physics students.  Grades 9-12