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In this activity, learners create a colorful bookmark using a super thin layer of nail polish on water. Learners discover that a thin film creates iridescent, rainbow colors.

In this activity, learners build a figure that moves and "comes to life" when they pull its string.

In this activity, learners cut out a fish and then "paint" it using universal indicator and acids and bases.

In this activity (page 1 of the PDF under SciGirls Activity: Rabbits), learners will visit a zoo, aquarium, or pet store to view a variety of fish.

In this two-part activity, learners investigate buoyancy, density and surface area as well as biodiversity and the relationship between the structure and function of organisms.

In this activity, learners construct bug models that "jitter" all over the table with just a battery, motor, and counterweight.

This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

The Ancient Egyptians used a naturally-occurring salt from the banks of the Nile River, called natron, to mummify their dead.

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

In this activity, learners build a bird that flies in place with help from a motor, wire, and some straws.

This activity includes several games about animal sounds. Using their sense of hearing and communicating with various kinds of noisemakers, learners role-play predator and prey.

In this activity with several mini experiments, learners explore the chemistry that helps scientists learn about the environment and how they can help save it.

In this group activity, learners act out key stages of the "ocean carbon cycle" (also known as the "carbonate buffer system") through motions, rearranging blocks and team tasks.