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In this fun gardening activity, learners discover their soil type. There are three basic soil types: sand, silt, and clay.

In this activity, learners hook up a hair to a lever system and create a hair hygrometer to measure changes in humidity.

Did you know that you would be a different age if you lived on Mars? It's true!

Ocean acidification is a problem that humans will have to deal with as we release more and more carbon dioxide into the atmosphere.

Before there were clocks, people used shadows to tell time. In this outdoor activity, learners will discover how to tell time using only a compass, a pencil, a handy printout, and a sunny day.

Did you know that a Slinky makes a handy model of earthquake waves?

In this activity, learners create a tornado in a bottle to observe a spiraling, funnel-shaped vortex. A simple connector device allows water to drain from a 2-liter bottle into a second bottle.

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!

In this activity related to magnetism and electricity, learners create a magnetic field that's stronger than the Earth's magnetic field.

In this weather-related activity, learners make a portable cloud in a bottle.

In this activity, learners conduct a simple experiment to see how electrically charged things like plastic attract electrically neutral things like water.

In this activity, learners use simple materials to simulate the effect of X-rays in a safe way. Learners place a piece of window screen over a box and a cardboard pattern on top of the screen.

This is a lesson plan for an activity in which learners, playing the role of archeologists, use math concepts about number bases to decipher the Dresden Codex, an ancient Mayan document.

In this activity, learners observe as soap bubbles float on a cushion of carbon dioxide gas. Learners blow bubbles into an aquarium filled with a slab of dry ice.

In ancient Chaco Canyon, the people used a "sun dagger" petroglyph to mark the passing of seasons.

Demonstrate the Bernoulli Principle using simple materials on a small or large scale.

This activity demonstrates liquefaction, the process by which some soils lose their solidity during an earthquake.

This activity shows how our experience of the Sun changes with time and location. The sun dagger at Chaco Canyon is thought by many to be a sort of ancient timekeeping device.

In this activity, learners make a 3-D model of magnetic fields by inserting a small, strong magnet into a sphere.