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In this activity, learners build a tool called an inclinometer that can find the height of any distant object, from a tree to the North Star.

This is an activity to do when there is a solar eclipse!

It's difficult to see convection currents in any liquid that's undergoing a temperature change, but in this Exploratorium Science Snack, you can see the currents with the help of food coloring.

In this activity, learners build bridges and cantilevers in a series of "building out" challenges with straws and pins.

If you had a long tube with a 5 millimeter wide slit, would you see the entire Golden Gate Bridge?

This is a game that is sure to sharpen players' basic math skills. Players must use four randomly selected numbers to create an equation that equals a fifth number.

Testing magnets is always a fun pastime, but here, we're going beyond "will it attract the magnet?" In this activity, learners will investigate which materials allow magnetic fields to pass through or

Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

In this trick, hold your hand over a burning candle without getting burned, by reflecting and transmitting the light of two candles. This activity is best suited as a demonstration.

In this activity, learners use a hand-made protractor to measure angles they find in playground equipment.

Listen to the beat of gravity. By taking two strings with weights tied to them at different, yet uniform intervals, you can hear the uniformity (and rhythm) of gravity's accelerating pull.

In this activity, learners build large-scale structures and cantilevers in a series of "building out" challenges with garden poles and tape.

Create an instrument that you don't play--you just listen to it through tubes of various lengths.

In this activity, learners try to figure out who has their matching rock type by reading a description of their rock (no talking!).

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

With a straw, two craft sticks, and some rubber bands, construct a noisemaker called a Sound Sandwich and explore how vibration produces sound.

In this activity, learners use heat to separate zinc and copper in a penny. This experiment demonstrates physical properties and how physical change (phase change) can be used to separate matter.

In this activity, learners explore electronics and motion by making a Scribbling Machine, a motorized contraption that moves in unusual ways and leaves a mark to trace its path.

This is an activity that demonstrates how batteries work using simple household materials. Learners use a pickle, aluminum foil and a pencil to create an electrical circuit that powers a buzzer.

This resource contains several mini-explorations using a slide projector as a light source to investigate light and the properties of images.