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Learners measure irregularly shaped bones using a variety of measurement methods and tools. Then, they measure again using standard conventions and metric tape measures.

In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

In this activity, learners build their your own seismograph with household materials to document shaking.

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.

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

In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made.

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

Learners will explore the concept of angular distance, and investigate why the moon appears to be the same size as the sun during a solar eclipse, despite the sun being much larger.

In this activity, learners sort different natural phenomena into categories (they occur on Earth, on the Moon, or on both), and then model how energy moves during a quake using spring toys.

In this activity you'll see how the sun's tilt on its axis changes the length of shadows. For example, why is your shadow longer in winter than in summer?

In this activity, learners will make their own prism and use a glass of water to separate sunlight into different colors.

In this activity, learners work in groups to design a parachute out of household items that keeps an egg secure when dropped from a certain height.