101science.com--Internet science portal to more than 20,000 science web pages
webelements.com--Explore key information about the chemical elements through this periodic table
Invention Dimension--Highlights a different inventor every week. Also games and links to other invention information.
Beakman & Jax--Lots of at-home experiments and the science behind them
periodicvideos.com--Videos and information about all 118 elements on the periodic table
The Human Heart: An Online Exploration--Virtually explore the human heart
The Human Brain--Get to know your brain – the food it likes, the challenges it craves, the rest it requires, the protection it deserves.
The Electronic Zoo--Site hasn't been updated in a while, but there is still some good information about animals and links to other animal websites.