Which public places harbor the most bacteria and germs? Test different environments to find out where the most bacteria live in this science project.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

This adventurous art project will send kids on a scavenger hunt for fall materials they can use in their artwork. This craft also teaches kids about seasons.

Create a DIY Electromagnet! Using a 9v battery to create an electrical field around a nail, students explore electromagnetism in this cool science project idea.

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

Check out this fun high school science fair project idea to investigate how the cell membrane regulates what moves into and out of cells.

Help your preschooler craft a homemade wind spinning device--a surefire to make your backyard sparkle, and teach her a bit about weather!

This science fair project idea investigates which objects float and sink in honey, water, and oil.

Looking for a fun summer adventure? Learn what it was like to be a prospector during the California Gold Rush by panning for gold in a local creek.

Tired of gum with flavor that lasts for just a couple of minute? Put gum to the test with this chewy science experiment!

Using a toy race car kids create a visual model of the Doppler Effect.

Slip some science into storm watching with a homemade rain gauge!

Learners hypothesize about and experiment with soil erosion in this hands-on activity.

This science fair project idea demonstrates that plants give off water.

Enjoy those warm spring and summer nights with your child while teaching some basic astronomy at the same time.

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

Teach your child the meaning of recycle and reuse by repurposing plastic spoons as plant markers for your vegetable garden.

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

This science fair project idea explores how water and ice can change the form of rocks.

Your kid will be captivated as she watches liquids change color before her very eyes during this fun science project that introduces some chemistry basics.

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

Help children understand the power of germs and the importance of hand washing with this visual activity that introduces the concept of scientific inquiry.

The buoyant force of water explains why some objects float in water. But why do some objects sink? Find out in this physics experiment and learn about density.

This science fair project idea teaches about the size of two different systems: the solar system and an atomic system.

Test whether plants can grow without sunlight and water.

Do you think you can blow down a sand castle with a mighty wind? Find out which material stands up best to erosion in this erosion experiment.