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What's a Pickle-Oh? Two pieces of pickle on a stick are connected to a Pico Cricket (micro controller). When you slide the pickles apart the note changes.

In this hands-on activity, learners use an assortment of (mainly household) items to complete Rube Goldberg-type challenges.

The goal of this activity is to design, build and test a house or toy for an animal.

In this activity, learners build a paper stellated rhombic dodecahedron, a three-dimensional 12-pointed star.

In this activity, learners make a paper model of a polymer, then make Silly Putty, an actual polymer.

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 design activity, learners create a vehicle that can transport a load, like a favorite toy or as a recycled object, from the top of a zipline to the bottom using only gravity.

In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

In this activity, learners are challenged to design and construct a trophy for prize-winning sports equipment.

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

In this activity, leaners explore building techniques by recreating the story of The Three Little Pigs.

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

In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

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

This activity (on pages 19-24) introduces learners to the rain forest's layers—emergent, canopy, understory, and forest floor—and has learners make paper lianas (vines that live attached to trees) and

This activity (on page 2 of the PDF under SciGirls Activity: Music and Sound) is a full inquiry investigation into sound frequency.

In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

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 will participate in a scavenger hunt involving sizes, shapes, and numbers. This activity works well with a whole group, individuals, or families.