This two-ingredient dough, sometimes called "moon sand," is a quick and cheap way to let kids explore their senses, build fine motor skills, and play.

Let your kid experiment with textures among fabric and other materials that are smooth, rough, soft, or slippery—and then they'll make a texture book!

Your preschooler can learn how to siphon water with just two bottles and a plastic tube in this fun, educational science activity.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

In this science fair project, young children discover what happens when two fluids that have different densities get together.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

Boost your preschooler's attention to detail by getting her to explore the differences between two different pumpkins: large and small.

Tin can phones offer something modern versions don't—a fun project to make with a friend, and a dramatic illustration of vibration and sound waves.

Hold a magnet marathon! Explore the power of magnets with your kindergartener in this entertaining and simple science game.

This classic children's game demonstrates how sound travels through air vs. through a solid.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

This experiment challenges students to forecast the weather based on the surrounding areas' weather.

In this project, create and examine garden mulch to find out what critters live in the messy, muddy layers just above the soil.

Make a periscope with milk cartons and mirrors! This preschool activity is great for playing secret agent and learning simple physics.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

Magnets may hold up papers on the fridge, but is it the paper that attracts them? Find out more with this kindergarten science investigation.

This science fair project teaches students about wilting and browning of salad greens.

Here is a kindergarten activity that blends art and science by using magnets, paint, and objects found around the house to create a picture.

Help children understand the power of germs and the importance of hand washing with this visual activity that introduces the concept of scientific inquiry.

Use this fun activity to make an optical illusion picture that helps your kindergartener explore the sense of sight, and sharpen his observation skills!

Why do plants wilt? Kids will learn to think critically about what environmental factors affect plants, and what plants need to survive.

In this fun design challenge, your child will get creative with making structures out of toothpicks and gumdrop candies.

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.

Invite your kindergarten scientist to conduct this color mixing experiment to discover which primary hues make a rainbow of secondary colors.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

This project leads to an understanding that a whole may be built of smaller parts that fit and work together and provides an introduction to basic tools.

In this science fair project, young children will become aware of and have the opportunity to experience the four basic tastes: sweet, sour, salty, and bitter.

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.