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The objective this science fair project is to determine whether a bigger bag will allow a homemade hot air balloon to fly higher than smaller bag.

With a clear bottle and a few plastic straws, you can easily make a hummingbird feeder and demonstrate the effects of atmospheric pressure at the same time!

In this activity, you'll not only make your own bouncy balls at home, but your child will also learn how polymers are made.

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.

Here's a fourth grade science craft with lots of benefits: it's good for birds, good for your child's learning, and good for the planet, too.

This science fair project idea explores how far the âdanger zoneâ is from different types of caution signs.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Make sourdough bread...and learn some colonial history and modern science in the process!

In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

In this activity, children will work on their mathematics and engineering skills as they attempt to recreate the Eiffel Tower out of building blocks!

Explore if planting seeds in a certain direction will affect how fast it germinates.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.

Here's a fun activity that will have your child researching, collecting, and charting plant specimens from the neighborhood.

This science fair project idea measures the growth of bread dough and finds out how long it takes for the dough to stop rising.

Children combine an acid and an alkaline substance to simulate a volcano eruption in this fun experiment.

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

In this activity your child will make a coiling snake out of simple household materials, and also find out why they coil.

Show your child how and why the microwave works, while demonstrating just how strangely foods can behave while inside the crazy cooker.

What are the benefits of good posture? Kids will learn about the cognitive effects of good posture through conducting and observing a controlled experiment.

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.