In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

The next time you and your fifth grader go on a hike, take along this key to figure out which common North American animal left a track along the river bank.

Kids conduct a simple birdseed experiment to figure out what kinds of birds live nearby in this fun science activity.

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

Use simple items to create a kindergarten "grow box" that lets a kid see just how salad plants send down their roots and grow underground.

In this activity your child will make a coiling snake out of simple household materials, and also find out why they coil.

In this plant habitats activity, children play the role of an ecologist and take surveys of different areas to discover the best habitat for dandelions.

In this game, players will learn interesting facts about animal adaption and practice them using a fun matching card game!

This activity will introduce your child to the four different components of blood and give him a fun way to visualize its properties.

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.

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

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

Want to help make studying the nervous system a little more fun? This thinking cap is a great way to learn external human brain anatomy.

Make sourdough bread...and learn some colonial history and modern science in the process!

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

For a fun family activity to introduce your child to genetics, have your child go on a search for dominant and recessive family genes!

This basketball project explores the best way to make the perfect shot every time.

In this outdoor science activity you'll find tips on how to create a nature journal by choosing a native plant or animal and tracking that species.

Roasting pumpkin seeds makes for a great Halloween activity, and a healthy snack!

This science fair project idea experiments with spinning color wheels and optical illusions.

With this hands-on activity, you'll show how fall colors are hidden in the leaf all year long!

Boys might wrinkle their noses at the thought of gardening, but we guarantee they'll like this activity! Make a recycled terrarium full of bug-eating plants.

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

Here's a fun activity that will have your child researching, collecting, and charting plant specimens from the neighborhood.

Perk up your front porch with this hanging vase craft, perfect for spring and for getting kids outdoors!

In this science experiment, your child will test the strength of hollow structures in order to understand how strong bird bones really are.

Does your middle school teenager have good reflexes? Gauge his reaction time in this science and math activity that requires only a yardstick and a friend.

Which do you prefer: real or artificial? Try this sweet little taste experiment to help your kids develop a better awareness of the food they consume.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Science fair project that compares the biodiversity of fungi in different ecosystems by identifying species of fungi.