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In this activity, learners are challenged to build a bird feeder using recycled materials from home and are encouraged to problem solve during the extensions.

An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens.

In this activity, young learners (2 years and up) explore tree structure and biology. Tree products are explored by painitng with fruit.

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

Explore the effects of gravity on a slowly falling object: a parachute you make out of plastic bags, string and stones.

Make impact craters with marbles (or rocks or washers) in a container of flour. Find out what you can learn about your "comets" by the craters they make.

In this activity, one person acts as a human robot while another acts as their developer by programming their actions.

This warm weather activity introduces learners to the impact trees have on blocking the sun's heat and reducing temperature on the Earth's surface.

In this activity, learners make a solar oven. Learners witness the awesome power of the sun to make a yummy treat--a chocolate chip cookie!

In this math lesson, learners estimate distances between landmarks and use a map and scales to determine the actual distances.

In this activity (located on page 3 of the PDF), learners investigate the way water moves and how we can control and direct water.

In this activity, learners use an astrolabe to measure the altitude of objects. Learners will first practice taking measurements by measuring the altitude of trees and buildings.

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 explore the physics of impact craters from their own backyard using mud. Learners are encouraged to match features of real impact craters to their models.

This guide outlines how to plant a garden even if you don't have a yard!

In this environmental science activity (page 3 of the PDF), leaners will identify and explain the causes of erosion.

In this activity, learners discuss and investigate how cameras, telescopes, and their own eyes use light in similar ways.

Learn about friction and kinetic energy with this cool spinning toy.

In this version of tag, a large group of learners model how the body fights infection. Learners act as germs, as lymphocytes, and as the body's cells threatened by germs.

In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.