What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

This science fair project idea determines if the temperature of rubber effects how high it bounces.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

In this design challenge, your child will create a parachute for a small toy using typical household items.

Kids learn about examples of mechanical weathering and conduct an experiment with seeds and plaster in this cool geology science fair project idea.

Kids will create their own version of Richard Feynman's rubber band heat engine to learn about thermodynamics with this cool science fair project idea.

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.

By using static electricity generated from their body, a child can cause a small fluorescent lamp bulb to light up!

Is your child a nature nut with an eye for creative, green-friendly projects? Introduce them to this amazing DIY bird feeder!

This activity challenges students to use computational thinking as they create a sequence of commands that will make a robot navigate around several obstacles.

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.

Do lefties just write different or are their brains different? This science project has students explore what it means to be left handed.

Do plants breathe? Not exactly. They do respire though! This activity will help your child with see that plants are producing the oxygen we need to survive.

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!

This science project challenges students to study deer behavior in their natural habitat- the feeding patterns, social behaviors, male to female ratio, etc.

Kids learn how to manipulate additive and subtractive colors to send secret messages with red colored filters in this cool science fair project idea.

Science fair project that determines whether mass and weight are the same or different.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

This kinesthetic learning activity will help your fourth grader get a firm grasp on the immensity of the solar system.

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

Your kid can learn about the process of making frozen yogurt and enjoy a homemade, flavorful dessert. Experiment with this fun, chilly food!

Popsicles aren't just for the summertime, this activity takes cold and turns it into a creative and tasty science experiment.

In this activity, your child will learn about a style of gardening that uses moss, also called "kokedama."

This activity works well with a group or just with a parent and child, and it can make a great party game since it's both fun and inexpensive.

Delight your budding scientist with this cool physics magic trick and teach her some basic physics concepts while you're at it!

Help your fifth grader embrace the roots--literally--of Mother's Day by growing carnations to honor mothers in you family's history.

This science fair project examines how seeds hitchhike on animals and clothing.