In this cool physics experiment, use double plane mirrors at various angles to learn about light reflection. Then, see if you can solve a puzzling problem!

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

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

This science fair project idea examines the reason boats are shaped and engineered.

In this fun guessing game, your child uses his sense of smell and taste to figure out what is in the container. Here's how to play:

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

Science fair project that examines how yeast grows, and which conditions allow for optimal growth. What types of nutrients does yeast prefer?

Learn about this simple machine and make a pulley of your own to use for fun science trials.

In this fun experiment, learn about brand awareness and the influence of media on children by testing logo recognition in different age groups.

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

Science fair project which uses coins flips to visually demonstrate the probability of an event and how to express it.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

Create your very own scented hand sanitizer that will help your child to keep those nasty germs at bay!

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Learn about savanna flora and fauna in this science project! Take a look at characteristics of tropical grassland plants and animals that help them survive.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

Experiment about connection of senses of taste and smell. Using blindfold and noseplugs, administer blind taste test. Analyze results and organize data.

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

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

In this insulation experiment, you'll learn which clothes keep you warm in the cold, and which make you shiver.

This two-ingredient dough, sometimes called "moon sand," is a quick and cheap way to let kids explore their senses, build fine motor skills, and play.

By incorporating natural materials and the powers of observation, your child will become a backyard naturalist while building early writing and drawing skills!

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

In this project students experiment with making music using only glasses of water.

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

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

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.