Bug Biology - Investigate and study insects here.
Chem4Kids - Elements and the periodic table.
Department of Energy - Energy information for kids including glossaries, energy sources, a home energy audit and more.
Flash Earth - Satellite and aerial imagery of the earth.
How Stuff Works - Easy-to-understand explanations of how the world actually works. All topics are covered to demystify the world in a clear-cut way.
LiveScience - Science, technology, health and environmental news.
Measurement/Unit Conversions - Find out how to convert measurements of all kinds: weight, volume, temperature, size, distance. etc.
National Geographic for Kids - Animals, nature, stories and facts.
National Weather Service - Weather from NOAA, the National Oceanic and Atmospheric Administration.
Nature Wages War - Resources for students about earthquakes and tsunamis.
New York Times - interactive sites about: The Crippled Japanese Nuclear Reactors, Map of the Damage from the Japanese Earthquake, and How Shifting Plates Caused the Earthquake and Tsunami in Japan.
NSTA - Outstanding Science Trade Books for Students K–12: 2009
Periodic Table of the Elements - Periodic table.
Science Lab - Online stop for science stuff.
U.S. Geological Survey - earthquake information here.
Weather.com - National and local weather forecast, radar, map and report.
Why Files - Well-researched, educational descriptions of the actual science behind current news stories.