Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

Try this simple activity with your child to guesstimate the age of a tree in your yard and nurture her developing math skills while you're at it!

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

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

Help your kindergarten science maven explore the water cycle without getting everything wet.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

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

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

This science fair project idea determines if the color of light affects the growth of plants.

Challenge your learner to design and build a city of their own in this creative engineering activity.

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.

With this hands-on activity, you'll show how fall colors are hidden in the leaf all year long!

In this activity, your child will be challenged to use simple materials to create a catapult for a small, lightweight toy.

This science fair project idea investigates how color affects temperature.

This light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

What causes sound? Here's a simple science experiment that adds a visual element to the science of sound to help kids better understand this tricky concept.

This simple experiment serves as an introduction to the greenhouse effect.

This science fair project idea examines whether the colors of the spectrum respond differently in the thermal aspect when radiated by the sun.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

What's the quickest way to separate salt and pepper? Let static electricity do the work! Your child will be fascinated by this simple experiment.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

Kids learn about potential energy, and mechanical energy, and how to make power from water with one of our favorite renewable energy projects for kids.

Help your child learn about animal classification with this fun and delicious activity.

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.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

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 investigates how magnetism can defy the force of gravity.