If you are interested in science that is beyond Earth, check out Amazing Space! You can learn all about space with doing many cool activities.
How Stuff Work does just that! Teach how stuff works!
National Geographic Kids is a highly engaging site that offers a variety of topics, games and activities for kids!
If you have the next Jacques Cousteau in your life, Young Ocean Explorers is a site you should be familiar with! From sharks to turtles, all of the sea creatures are covered and discussed!