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Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

Construct and experiment with a periscope using reflected light rays to gather an image.

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

Create a DIY Electromagnet! Using a 9v battery to create an electrical field around a nail, students explore electromagnetism in this cool science project idea.

Science fair project in which you will start a fire from scratch without using matches or a lighter.

Teach your child how to make an all-natural, yellow-brown dye, using just walnut shells and water. This deep dye can be used on textiles, art, and wood.

This project is a great way to explore variations in how to paint using watercolor.

Throughout history, people have used song as a teaching and memory tool. This project explores whether song improves a person's ability to retain information.

Create a fun hands-on game to practice long division, using magnetic numbers on a fridge.

Similar to fried rice, this quick fix scramble uses leftover quinoa and vegetables.

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

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

Batik is a traditional Indonesian craft, which uses a technique of drawing wax on fabric to create patterns before dying.

Challenge your child with this exciting 2D to 3D project using a sheet of construction paper, oil pastels, and scissors.

In this cooler-than-average writing activity, your child uses paint chips and words to write a story!

In this design challenge, your child will make a bottle rocket using typical household items.

Using only straight-line sewing, your fourth can create a nifty felt pencil case perfect for his busy life.

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

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

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

Your child can re-purpose any used (and cleaned) can into a colorful container to hold Dad's pens and pencils on his desk!

Here's a great activity to get your child using imagination and artistic skills to create a handmade vocabulary book, complete with illustrations!

Whatever is stacked in your cupboard can be used to help your child learn how to compare fractions and decimals. A great hands-on math lesson!

Science fair project in which you will examine how crystals are formed by creating your own crystal using charcoal briquettes, salt, and ammonia.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

Make environmentally friendly, chemical-free toothpaste using one of the most common, inexpensive pantry staples in the American kitchen: baking soda.

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.

Using low-tech supplies and a little extra ingenuity you can help your fourth grader create this unique, heartfelt Valentine card.

In this activity, your child will get a review of addition, subtraction, multiplication and division using classic domino pieces.

Show your fourth grader how to design and print his own chop, a Chinese "signature" of sorts that uses calligraphic characters or motifs.