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Learners conduct an experiment to determine the rate at which two materials, sand and water, heat up and cool down.

Using indirect methods, learners determine the shape and size of a piece of carpet hidden under a piece of plywood.

Learners design their own experiment to determine which M&M color dissolves the fastest in water.

In this activity, learners explore a scale by comparing objects, which look similar but have different weights. Learners predict and then measure the weights of various objects using a scale.

Learners initially test to see how many drops of liquid (water, rubbing alcohol, and vegetable oil) can fit on a penny.

In this activity (page 26 of the PDF), learners make observations, formulate hypotheses and design a controlled experiment, based on the reaction of carbon dioxide with calcium hydroxide.

Each learner chews a piece of gum until it loses its flavor, and then leaves the gum to dry for several days.