Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.

Discover flight initiation distance as you play around in the park with this fun bird watching project!

This science fair project idea provides evidence that air is everywhere and takes up space.

Learn about the microclimate of your backyard by tracking rainfall, temperature, and observed weather with hand drawn charts and graphs.

Do you think heat can affect a plant's growth rate?

In this design challenge, your child will make a bottle rocket using typical household items.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

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

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

This science fair project idea examines liquids of different densities.

In this project, a model of a submarine is built to simulate the buoyancy and displacement of water and air.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

Find out whether putting something on top of a plant will inhibit its growth.

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

Help your kindergarten or first grade child use his creativity to make a beautiful magnetic patterned structure while discovering the wonders of magnets.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

This science fair project idea investigates if webbed feet help a duck (and others) swim.

In this activity, students will think about the form and function of household objects as they compare and contrast kitchen serving spoons of various sizes and designs.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

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.