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

In this activity about problem-solving, learners build a house for the Three Little Pigs using twenty straws and two index cards.

In this activity, learners make their own binary code bracelets by translating their initials into 0s and 1s represented by beads of 2 different colors.

Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

In this pencil and paper activity, learners work in pairs and simulate how astronomical spacecraft and computers create images of objects in space.

In this activity, learners will build the highest tower they can out of recycled materials.

In this activity, learners help a poor cartographer color in the countries on a map, making sure each country is colored a different color than any of its neighbors.

In this activity, learners listen to songs and decode hidden messages based on the same principle as a modem. As a final challenge, learners decode the binary messages in a music video.

In this activity, learners build unique yo-yos, which spin round and round without moving up and down.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

Build a house you can fit inside, using cardboard tubes.

In this activity related to microbes, learners create scale models of microorganisms and compare relative sizes of common bacteria, viruses, fungi and protozoa using metric measures: meters, centimete

In this activity, learners build scaled-down structures and cantilevers in a series of "building out" challenges with bamboo skewers and tape.

In this activity, learners discover that some things only stand up while they are spinning.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.

In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.

This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.

In this archaeology activity, learners consider ways in which excavating an underwater site is different from excavating a terrestrial site.

In this three/four-day lesson, learners calculate perimeters and areas and draw the castle plan to scale.

In this activity, learners make or use pre-made clay beams to scale and proportion. Specifically, they discover that when you scale up proportionally (i.e.