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In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents.

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 web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.

In this outdoor water activity, learners explore how to change the direction of water flow. Learners make puddles in dirt or use existing puddles and sticks to make water flow.

In this activity, learners explore the engineering and principles behind working elevators.

A group of 6 learners works together as a team with each learner performing a different role. Together, they need to maneuver a die through a maze.

In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

In this activity, learners light an LED with five cents. Learners use two different metals and some sour, salty water to create a cheap battery.

In this activity, learners will create their own percussion instrument with recycled materials. Learners will explore design, fabrication, cause and effect and sound through this activity.

In this activity, learners explore how engineering has impacted the development of bridges over time, including innovative designs and the challenge of creating bridges that become landmarks for a cit

In this activity (on pages 20-23 of PDF), learners build a model of a power plant using simple materials.