You don’t always have to buy a kit or make a trip to the hardware store to do cool science experiments at home; if you’ve got vinegar, baking soda, pennies and plastic bottles, you’ve probably already got what you need to do a Mad Science Experiment from Reeko Science.
Projects are labeled easy, medium or hard and are sorted by a dozen different science topics- from electricity and chemical reactions to light and sound. The site is well organized, very informative, and written with a sense of humor (though the jokes can get a little tiresome). Although older kids can probably understand and do most of the easy experiments on their own, the site is designed to have adults and kids work together; most experiments include Advanced Notes for parents and teachers that explain more details about the science involved.
The Reeko Science site is filled with science facts, statistics and hidden messages to decode. The Fun Stuff section is a little confusing (I didn’t understand some of the instructions), but Resources has some good links and a great glossary.