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.

Do different types of oil mix or stack? Find out in this science fair project idea!

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.

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.

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

In this science fair project, students create their own miniature salt flats at home.

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

Examine the effect of pressure on carbonation in soda.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

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

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!

Take advantage of the spring and summer sun in this arts and crafts activity that has your learner creating pretty flower prints.

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.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Study the life cycle of the common blowfly as it relates to forensic investigation. Record the first time you see flies, maggots, and eggs.

Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.

Examine which metal conducts more heat by boiling water in 3 pans made of aluminum, copper, and stainless steel.

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

Help your child create a working lung model that fills with air just like the lungs inside of his own chest when he breathes.

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

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

Help your child get a grasp on what it was like to build gigantic ancient structures with this easy engineering activity about science and physics.