100 Solutions to Reverse Global Warming

Noted climatologist Katharine Hayhoe recommends this site to learn how to combat global warming and not feel so powerless: Drawdown.

World Science U

Brian Greene's brilliant brainchild: World Science U

The Skeptic's Dictionary

The Skeptic's Dictionary - "exploring strange beliefs, amusing deceptions and dangerous delusions since 1994"

National Geographic's Project Noah

Project Noah - to be honest, I'm not exactly sure what this does besides the fact that it does have educational components and some golly-gee factor, per norm for Nat Geo stuff. I think, though, that especially if you're a teacher or homeschooling parent who wants his/her kids to learn more about nature, this would be worth signing up for and looking into. I've just not had the time to explore it much yet since my sister introduced me to it yesterday.

Space Place

NASA's Space Place - science-learning fun

Black Holes explained

http://hubblesite.org/explore_astronomy/black_holes/ - always a fascinating topic

Learning Science

Learning Science - free science resources for teachers and students

Center of Science and Industry

COSI - Center of Science of Industry - lots of cool online activities

Science videos

The Vega Science Trust Videos - oh my goodness, I think I'm going to love this site! How can I not with Feynman featured first and prominently?

(Thanks to Diane Flynn Keith's Clickschooling e-newsletters)

ScienceCasts Youtube channel

ScienceCasts from NASA on YouTube

Soil Science

Soil Sciences Education Page by NASA

Human body & Mind

Videos on the human body and mind from the BBC

Science Toy Maker

Science Toy Maker...man, do they have cool projects!

Interactives

Interactives from Learner.org - :provides educators and students with strategies, content, and activities that can enhance and improve students' skills in a variety of curricular areas"

Academic Earth

Academic Earth - "online courses from the world's top scholars"

The College of Science

The College of Science free e-courses

Planet Science

Planet Science: free science resources for kids, teachers, and parents.

Learner's TV

Learner's TV: "This is a comprehensive site providing thousands of downloadable Video lectures, Live Online Tests,etc in the fields of Biology, Physics, Chemistry, Mathematics, Computer Science, Engineering, Medicine, Management and Accounting, Dentistry, Nursing, Psychology, History, Language Training, Literature, Law etc FREE to its visitors."

This site sounds amazing; I've not tried it yet, but hope it's as good as it sounds.

Khan Academy

With all the good reviews I've heard about this site, I'm surprised that I don't already have it down.  Khan Academy has videos on math, science, and some other topics.

Nature Rocks

Nature Rocks - source of indoor and outdoor science activities. Read a terrific description of it at Homeschool Buyers Co-op.