Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

This science fair project idea investigates whether plants can survive being frozen.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

Determine whether butterflies like to drink sugar water, salt water, or plain water.

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

This science fair project introduces children to static electricity and the idea that electricity is more than lights and plugs.

How good are humans at sound localization? Kids can try this cool science fair project idea to see how good their friends are at judging sound direction.

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

Invite your kindergarten scientist to conduct this color mixing experiment to discover which primary hues make a rainbow of secondary colors.

Reinforce your child’s understanding of the alphabet by helping them construct all of the letters using pipe cleaners.

Learn about where colors come from and how light absorption works in this fun experiment! All you need is a flashlight, construction paper, and cellophane!

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

Check out this cool science fair project idea to explore the risk of mechanical deterioration of artifacts placed in a storage box due to mold outbreaks.

Wonder why bugs always fly around your lights at night? This experiment determines whether insects are attracted to the heat or the light.

Determine if gender affects the ability to identify different smells.

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

Why do plants wilt? Kids will learn to think critically about what environmental factors affect plants, and what plants need to survive.

In this cool physics experiment, use double plane mirrors at various angles to learn about light reflection. Then, see if you can solve a puzzling problem!

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

This science fair project idea examines which type of insulation holds in the most heat.

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.