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Give Me a Brake
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In this activity, learners explore the concept of how brakes can stop or slow mechanical motion.

Sand Grain Observations
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In this activity (on page 1 of the PDF under SciGirls Activity: Earthquakes), learners will use a magnifier to carefully examine samples of sand from different locations.

Bring It Home: Animal Tracks
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In this activity, learners create handmade animal track stamps. Learners research animal tracks, draw the shapes on moleskin, and then stick the shapes onto blocks of wood to make stamps.

Bone Stress
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In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic.

Personal Fan
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Cool off in the heat with this project! Learners use simple materials to build a fan that runs on a motor.

Bacteriopolis
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In this long-term activity, learners make a home for a colorful community of microorganisms.

Why Does Food Spoil?
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In this activity, learners will conduct an experiment to discover methods of reventing foot mold growth on food.

Lost Labels
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In this experiment, learners will conduct chemical and physical tests to identify mystery substances.

School of Fish
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In this activity, learners will make fish cutouts that propel through the water with the help of surface tension.

Got Gas?
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Create gas with a glass of water, some wire, conductors and a battery! You will be separating water (H2O) into oxygen and hydrogen.

Tree Tally
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In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.

Periscope
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In this activity, learners construct a device that allows them to look over ledges or around corners.

Does it Stick?
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In this activity, learners will observe magnetic properties and sort objects by them. This activity uses everyday items to teach learners about magnetic forces, poles and properties of magnets.

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

Plant Piping
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Learners build models to learn about the special cells and structures that plants use to move water from their roots up through the stems and leaves.

Two Button Buzzer Circuit
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In this activity, learners explore an everyday situation, where either of two or more buttons can ring a buzzer.

Block Neighborhood
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In this activity learners will build a neighborhood out of blocks and cardboard.

Rubber Band Racers
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In this activity, learners explore the design of rubber band powered cars. Learners work in teams of "engineers" to design and build their own rubber band cars out of everyday items.

Buried Bones
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In this activity, pairs of learners will create two make-believe dig sites by burying chicken bones in plaster of Paris--a powder that hardens when wet.

Sensational Seaweed
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In this culinary activity, learners use multiple senses (sight, smell, touch, and taste!) to explore real seaweed samples.