Many ancient cultures used the rising or setting sun to create calendars. Observe the setting sun once a week to come up with your own solar calendar!

This project compares the strength of one, two, and three-ply toilet paper.

All you need are pencils, paper and some scissors to get started on this easy and fun game to review astronomy information, or other types of study concepts.

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Show your fifth grade scientist how to create a siphon using two buckets, plastic tubing, and water. Watch her astonishment as the water travels uphill!

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

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.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

Grow a garden with an environmentally-friendly twist by using plant scraps that usually get thrown away.

Here's a fun at-home activity that will help your child strengthen math skills using high and low temperature data, and become a master temperature tracker!

Your child helps the environment while saving your family money in this fun and rewarding "Gas Guzzlers" competition.

Grow potatoes in a plastic bag—easy to grow and harvest, and yummy to eat!

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

How do organic materials become soil? This science experiment measures what materials biodegrade.

The objective of this science fair project is to set up a compost bin to convert food scraps and organic waste.

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

Check out this science project idea to compare organic produce to non-organic produce and how preservatives in food extend the shelf life of goods.

Explore scientific concepts with this experiment that introduces kids to the scientific method!

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

Introduce your fourth grader to the concepts of solstices by observing the length of her shadow on the shortest day of the year, compared to other solstices.

This science fair project idea explores which fruit molds the fastest.

What are the effects of colored light on plant growth? Explore plant behavior in this cool botany science fair project and learn about phototropism!

Do you think heat can affect a plant's growth rate?

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

This science project encourages students to investigate the Mozart Effect, the idea that classical music promotes learning.

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

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

In this microwave plant experiment, find out whether microwave radiation will affect radish seed germination. Will it help or hinder the plants' growth?