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Seeing Your Retina
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In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself.

Eddy Currents
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In this activity related to magnetism and electricity, learners discover that a magnet falls more slowly through a metallic tube than it does through a nonmetallic tube.

Making a Battery from a Potato
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In this electrochemistry activity, young learners and adult helpers create a battery from a potato to run a clock.

Strengthen a Paper Bridge
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In this quick activity (page 1 of the PDF under SciGirls Activity: Tug O' War), learners will test how many pennies a flat paper index card bridging the gap between two stacks of books is able to supp

Pressing Pressure
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In this activity, learners compare water pressure at different depths. Learners discover that water pressure increases with depth.

Twist and Spout
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In this activity, learners make their own "tornado" using two soda bottles and water.

Bottle Cars
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In this activity, learners explore motion, energy, and electricity by constructing bottle cars that run on motors.
Moving Pictures
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In this optics activity, learners create flip books by drawing an image like an eye opening and closing on 24 small pages of paper.

Capturing Homemade Microgravity
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This activity (page 2 of the PDF under SciGirls Activity: Microgravity) is a full inquiry investigation into how ordinary things behave in microgravity, similar to what astronauts experience.

Mussel Your Way Through Photosynthesis
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Using zebra mussels (Dreissena polymorpha), elodea and an indicator dye, learners study the role of light in photosynthesis.

As Straight as a Pole
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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.

See the Light
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In this three-part activity, learners conduct simple experiments to see how light refracts and reflects, and how colors of light affect what we see.

Ping Pong Ball Shooter
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In this activity, learners use ABS pipe and an air leaf blower to make a strong shooting machine.

Diffraction
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In this optics activity, demonstrate diffraction using a candle or a small bright flashlight bulb and a slide made with two pencils.

Spectroscope
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In this activity (posted on March 12, 2011), learners follow the steps to construct a spectroscope, a tool used to analyze light and color.

Testing for Life's Molecules
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In this activity, learners conduct tests for proteins, glucose, and starch.
Pepper Scatter
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In this activity, learners explore the forces at work in water. Learners experiment to find out what happens to pepper in water when they touch it with bar soap and liquid detergent.

Stop the Stretching
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Learners work with plastic sheeting, masking tape, and string to design the perfect material for plastic chair webbing, and then construct their webbing.

Relative Speed of Dinosaurs
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In this activity, learners interpret three trackways and use measurements and a formula to infer the relative speed of dinosaurs.

Silly Putty Investigation
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In this activity (located on page 7 of PDF), learners explore how Silly Putty was first invented and then attempt to make a batch of their own.