What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

This tricky building block challenge asks your learner to think creatively. They will work on their divergent thinking skills as they try to fill up an index card perfectly with building bricks.

Soil and energy don't go together, right? That would be as bizarre as a pairing of peanut butter and marshmallows! Well, actually...

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

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 science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

Students will investigate the thermal conductivity of metals by learning how to measure thermal conductivity with this fun and easy science fair project idea.

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

This science fair project idea researches the effects of acid rain on plant growth.

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

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

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

In this exciting design challenge, your child will use design thinking skills to create a mixture that can inflate a balloon.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

In this activity, your learner will be challenged to create their own tic-tac-toe grid out of building blocks.

How would you dry your wet clothes if your dryer didn't work? Find out with this fun experiment!

This science fair project idea researches how your choice of clothing affect how hot or cool you feel during the day.

In this fun activity, your child will create their very own solar oven to bake s'mores!

Science fair project that identifies the differences between soils from different environments and attempts to figure out why those differences exist.

Take a dive into the candy jar with this yummy science experiment.

This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

With this science fair idea, little scientists will gain valuable insights into the physics behind throwing a baseball.

In this experiment you explore how tectonic plates move to create land and expand bodies of water.