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This activity (on page 2 of the PDF under SciGirls Activity: Hovercraft) is a full inquiry investigation into hovercraft engineering and design optimization.

In this activity, learners construct their own small catapults using simple materials. Learners follow visual instructions to build their launching device.

In this engineering activity (page 3 of PDF), young learners investigate how a pole can be made stable by “planting” its base in the ground or adding supports to the base.

Learners explore the Bernoulli effect by building an airfoil (airplane wing) and making it fly.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

In this simple and fun activity, learners build a tower of cups to explore distribution of weight. Learners make predictions about their towers and test their designs.

In this engineering/design/arts and crafts activity, learners design and build "platforms" or "bridges" that can hold weight, and test which glue makes the strongest structure.

In this Bob the Builder(TM)-themed activity, learners explore what it means to work together as a team.

In this activity, learners extract DNA from their own cheek cells, then create a rudimentary DNA profile similar to those seen on crime scene dramas.

No glue is needed for learners of any age to become marshmallow architects or engineers.

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

In this experiment, learners design and build a model room in a shoebox and furnish it with tiny furniture.

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