This site has links to several experiments and sample projects that are organized by subjects, (including electricity, medicine, botany, zoology, environment, and MORE), and also often organized by appropriate grade level (Elementary School, Middle School, and High School)

Search this website by keyword or browse by subject to find many science fair project ideas and procedures. Each project displays the difficultly level (Elementary School, Middle School, High School). You will also find several related links for other Science Fair Information.

Step by step instructions to a number of experiments can be found on this site.

Here you will find a useful handful of science project ideas with instructions for carrying it out and age-appropriateness level indicated.

Another handful of well presented step-by-step experiments and project ideas.

Another handful of well presented step-by-step experiments and project ideas.

This resources presents links to science experiment "how-to" guides and sorts them into categories: Force/Motion/Balance/Gravity, Locomotion/Flight, Temperature, Sound and Light, Electricity and more.

Read about what other kids did for their science fair projects to get ideas for your own. Each entry usually includes the grade the person was in when they did the project and what their hypothesis was…and often they explain how they went about their experiment.

Here is another site where kids have posted ideas that have worked for them…