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Critical Angle
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In this optics activity, learners examine how a transparent material such as glass or water can actually reflect light better than any mirror.

NEWspaper: Make Your Own Paper
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Learners make their own paper using old newspaper. Learners can make their paper colorful by adding construction paper.

Catapult
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Build a catapult that transforms the potential energy of a twisted rubber band into kinetic energy. Experiment with design variations so that you can hit a target with a projectile.

Make Ziff's Carpenter's Square
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In this Cyberchase activity, learners make carpenter's squares and use them to measure square corners. Learners cut out the carpenter's square template and attach it to tagboard.

All Wound Up
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In this activity, learners build a racecar using only a rubber band, spool, straw, and paper clip! This racer is a classic toy that zips across a flat surface.

Make a Light Fountain
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In this optics activity, learners make a "light fountain" from a clear plastic bottle, flashlight, and other simple materials.

Exploring the Universe: Filtered Light
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"Exploring the Universe: Filtered Light" demonstrates how scientists can use telescopes and other tools to capture and filter different energies of light to study the universe.

Float My Boat
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In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

Pedal Power
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In this engineering activity, learners examine bicycle mechanics and gear ratios. Learners determine which gears will help them bike a set course in the shortest amount of time.

Paint by the Numbers
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In this pencil and paper activity, learners work in pairs and simulate how astronomical spacecraft and computers create images of objects in space.

Gravity Fountains
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This activity (located on page 3 of the PDF under GPS: Glaciers Activity) is a full inquiry investigation into the forces of gravity and air pressure.

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

Balloon Hovercraft
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In this activity (on page 2 of the PDF under GPS: Luge Activity), learners will construct a model hovercraft out of an empty spool and a piece of cardboard.

Exploring Size: Tiny Ruler
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In this activity, learners investigate just how small a billionth of a meter is by attempting to cut a paper ruler down to a nanometer-sized sliver.

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

The Poor Cartographer: Graph Coloring
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In this activity, learners help a poor cartographer color in the countries on a map, making sure each country is colored a different color than any of its neighbors.

My Angle on Cooling: Effects of Distance and Inclination
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In this activity, learners discover that one way to cool an object in the presence of a heat source is to increase the distance from it or change the angle at which it is faced.

Mini Zoetrope
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In this activity (posted on March 27, 2011), learners follow the steps to construct a mini zoetrope, a device that produces an illusion of action from a rapid succession of static pictures.

Color by Numbers: Image Representation
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Computers store drawings, photographs, and other pictures using only numbers. Through this activity, learners decode numbers to create pictures using the same process that computers use.

One In The Hand
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In this physics demonstration, learners are challenged to break a raw egg just by squeezing it. Learners will be shocked by their inability to complete the deceivingly simple challenge.