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In this activity (on page 1 of the PDF), learners make a "mini-globe" to investigate the causes of day and night on our planet.

In this activity, learners model the gravitational fields of planets on a flexible surface.

In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.

In this design challenge activity, learners build a machine out of cardboard that runs smoothly and dependably. Learners must be precise to make sure their component works properly.

In this project, students explore how levers work, by making a puppet with moving limbs.

In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.

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

In this hands-on activity, learners will become familiar with the special adaptations of rainforest plants and discover the conditions needed for tropical trees to survive along with what can impinge

In this activity, learners create a three-dimensional sculpture while examining the characteristics of fish.

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

By tossing, collecting, and sorting beanbags, learners understand how the IBEX spacecraft uses its sensors to detect and map the locations of particle types in the interstellar boundary.

In this activity, learners use three types of cheesy snacks--cheese balls, cheese puffs, and Cheetos--to learn about polymers.

In this activity, learners work in teams to construct human lung models from small plastic beverage bottles and balloons.

In this yummy earth science activity (page 5 of the PDF), learners use fudge to learn about different kinds of lava.

In this activity, learners build water-propelled engines from soft drink cans.

In this activity, learners work in teams to investigate the composition of unseen materials using a variety of tools.

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