Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

This light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

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

This science fair project idea explores whether a plastic slinky works as well as a metal slinky when walking it down the stairs.

This science fair project idea investigates how the shape of an object affects drag.

Handedness and footedness refer to whether people prefer to use their left or right hand and foot. In this experiment, test hand and foot dominance.

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

This fun experiment provides a concrete and visually striking illustration of photosynthesis.

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

Discover how and which salt melts ice the quickest.

This science fair project idea investigates if webbed feet help a duck (and others) swim.

This science fair project idea produces sounds by creating vibrations using different objects.

This science experiment tests if dog saliva can really help heal wounds.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

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

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

This science fair project idea explores how length affects the weight a bridge can hold.

Science fair project that teaches you about chemical indicators and how to make your own in order to identify various mystery solutions.

In this science fair project, students will try to discover if test subjects can detect the presence of Monosodium Glutumate (MSG) in food.

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

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

This science fair project examines how seeds hitchhike on animals and clothing.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

This science fair project investigates why the number of visible stars changes from place to place.

This science fair project idea examines which type of insulation holds in the most heat.