Download the PDF file containing the cipher wheels. Copy and cut out the two wheels. Place the smaller wheel on top of the larger wheel and rotate them so your "key letter" on the small wheel is ...

Single-serving, see-through snack cup of gelatin (the lighter the color, the better: lemon, lime, and orange flavors work well) Viscous, edible dessert or sauce, such as pudding, yogurt, or chocolate ...

If you reach up and feel around your eye, you’ll feel the bone of your skull. There’s fat surrounding your eyeball to keep it from bumping up against the bone and getting bruised. In the cow’s eye ...

Make models of the earth and moon Make a model Earth by rolling out a small ball of green or blue clay. The ball should be between ½ to ¾ inches (about 1.5 to 2 cm) in diameter (click to enlarge photo ...

When you removed the cards from one set of bottles, the hot water stayed on top and the cold water stayed on the bottom, with the colors staying pretty much the same. In the other set, however, ...

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Free Admission for California Public School Teachers California public school K–12 teachers receive free admission to the Exploratorium. Teachers who qualify will be given one free, nontransferable, ...

The purpose of any leavener is to produce the gas that makes bread rise. Yeast does this by feeding on the sugars in flour, and expelling carbon dioxide in the process. While there are about 160 known ...

The Sun and moon aren’t really the same size, of course: the Sun is 400 times the diameter of the moon. But it’s also 400 times farther away from us, and this relationship between size and distance ...

What should I wear? You'll want to wear comfortable clothes. We recommend layers, so that you're ready for whatever San Francisco weather comes your way—sun, fog, or a chilly ocean breeze. Comfortable ...

Pi (π) has been known for almost 4000 years—but even if we calculated the number of seconds in those 4000 years and calculated π to that number of places, we would still only be approximating its ...

Make a simple mini-motor.Give the coil a spin to start it turning. If it doesn’t keep spinning on its own, check to make sure that the coil assembly is well balanced when spinning, that the enamel has ...