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In this activity, learners explore the engineering design process and the basic mechanics behind building bridges as they build one themselves using gumdrops and toothpicks.

Learners experiment with a commercially available liquid-crystal coaster. They warm the material with their hands for varying lengths of time and observe the changing colors that result.

In this activity, learners collect worms and then observe how they move.

In this activity, learners make a miniature greenhouse or "terrarium" to explore the greenhouse effect.

In this space science activity, learners explore transits and the conditions when a transit may be seen.

In this activity, learners explore the different heating properties of soil and water.

In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

In this activity, learners map their world by drawing a plan of their bedroom.

Combine math and exercise with this activity. Learners count how many times in a row they can skip rope or throw and catch a ball.

In this activity (page 1 of the PDF under SciGirls Activity: Double Dutch), learners will stand twelve feet apart swinging a rope at the slowest tempo possible while someone uses a stopwatch to record

In this activity (posted on March 14, 2011), learners follow the steps to construct a camera projector to explore lenses and refraction.

The Chinese invented paper made from plants and cloth about 2,000 years ago. Learners follow a similar process to make paper from recycled paper.

In this activity, learners explore physics by building a catapult that launches marshmallows with household objects.

In this activity, learners will measure the length of a shadow and use the distance from the equator to calculate the circumference of the earth.

Learners examine the manufacturing process while they make picture frames from cereal boxes.

In this activity, learners discover how solar energy can be used to heat water.

In this physics activity (page 6 of the PDF), learners will explore how static electricity affects surrounding objects.

In this activity, learners follow simple directions to explore and create platonic solids.

In this lesson plan, learners examine some of the of greenhouse gas emissions sources in their community.

In this activity, learners use a simple 3D model to discover why the Moon has phases.