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In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.

Put a string around your head, and play it! Learn about vibration, sounds, and pitch.

In this three part activity, learners explore and experiment with shadows to learn about the Sun's relative motion in the sky.

This fun, nighttime hands-on astronomy activity lets learners explore how long it takes for light from different objects in the universe to reach Earth.

This fun astronomy activity allows learners to experience finding stars in the night sky that will eventually go supernova. This activity is perfect for a star party outdoors.

In this activity, learners create a hearing based memory game that they can share with friends.

This activity (9th activity on the page) about hearing demonstrates to learners the importance of having two ears.

In this activity, learners control the (apparent) size of a hole with their brain.

In this activity, you'll use a straw, a water bottle and a paper tube to make an instrument that's very much like a saxophone.

See and hear how sound waves travel through different types of materials. Extend the experiment online and learn how you can "see" with sound waves using ultrasound.

In this simulation activity, learners observe what can happen when ocean waves churn up water and oil from an oil spill.

This activity (aka "snack") provides instructions for discovering your blind spot. It is an exploration of light and visual perception using simple materials you may have around the house.

In this activity, learners surprise their eyes with an optical illusion involving arrows made out of pipe cleaners.

In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.

In this activity, learners create a straw oboe to explore sound and pitch.

This is a classic exercise for visualizing the scale of the Solar System.

In this activity related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

In this activity, learners will discover how to find the "sweet spots" on a baseball bat. Whenever an object is struck, it vibrates in response.