The Adventures of Herman the Worm
Dr. Perlman's Site
Dig It! The Secrets of Soil
And Even One More Look At The Rock Cycle
The Old Farmer's Almanac
Blue Hill Observatory
The Nature Conservancy ~ Be sure to check out the virtual field trips.
Welcome to Science Bob
64 Easy Science Experiments for Kids to Do at Home
Audubon for Kids
Mass Audubon
Firefly Watch Citizen Science Project