Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

This science fair project uses paper chromatography to investigate whether black, brown, orange, and purple are pure colors or mixtures of other colors.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

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

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

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.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

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

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

This science fair idea examines hydrogel superabsorbent polymer crystals. They can absorb 500 times their weight in water. Can they absorb other liquids too?

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

Science fair project that develops latent fingerprints on a non-porous objects by converting superglue from a solid state to a gaseous state.

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

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

In this science fair project, students use the streak test to tell minerals apart from each other.

Science fair project that identifies the differences between soils from different environments and attempts to figure out why those differences exist.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

With this science fair idea, little scientists will gain valuable insights into the physics behind throwing a baseball.