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The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.

1 cent - $1 per student Ages 6 - adult 10 to 30 minutes
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Students design and create their own air-powered rockets, in this hands-on activity.

$1 - $5 per student Ages 6 - 11 30 to 45 minutes
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In this activity, learners design a flag for a chosen or assigned planet. The instructions include information about flags on Earth, and a list of flag references.

1 cent - $1 per group Ages 6 - adult 10 to 30 minutes
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In this activity, learners build a machine made of craft sticks to multiply the levering motion of their hands and create a device that bends and extends.

$1 - $5 per student Ages 6 - 14 1 to 2 hours
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In this activity, learners construct a simple game to test their hand-eye coordination and steadiness of hand.

1 cent - $1 per student Ages 6 - 14 30 to 45 minutes
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In this activity, learners make a paper model of a polymer, then make Silly Putty, an actual polymer.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes
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The goal of this activity is to design, build and test a house or toy for an animal.

$1 - $5 per group Ages 4 - 18 30 to 45 minutes
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This fun activity uses simple materials such as milk cartons and mirrors to introduce the ideas of optics and visual perception.

$1 - $5 per student Ages 6 - 11 10 to 30 minutes
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In this activity, learners will build the highest tower they can out of recycled materials.

free Ages 4 - 14 45 to 60 minutes
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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.

1 cent - $1 per group Ages 6 - 18 30 to 45 minutes
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In this activity, learners will keep track of how much they can do in one minute. Instructors can pick something everyone will do for a minute, such as jumping up and down or drawing stars.

free Ages 4 - 14 5 to 10 minutes
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In this activity, learners build a bird that flies in place with help from a motor, wire, and some straws.

$5 - $10 per student Ages 6 - 14 30 to 45 minutes
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In this craft activity, learners create a string of cut-out moons and stars.

1 cent - $1 per student Ages 4 - adult 30 to 45 minutes
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In this hands-on activity, learners use an assortment of (mainly household) items to complete Rube Goldberg-type challenges.

$1 - $5 per student Ages 4 - adult 10 to 30 minutes
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This activity attempts to clear up the common misconception that deserts are always hot, totally dry, and uninhabitable.

$1 - $5 per group Ages 4 - 11 30 to 45 minutes
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In this activity, learners listen to songs and decode hidden messages based on the same principle as a modem. As a final challenge, learners decode the binary messages in a music video.

free Ages 6 - 18 30 to 45 minutes
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In this tasty activity, learners make their own ice cream any day of the year in an exploration of heat and cold. Highlights include freezing and melting and the transition from liquid to solid.

$1 - $5 per student Ages 6 - 11 45 to 60 minutes
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In this outdoor activity, learners construct bird feeders and set them up at to investigate bird behavior for one or two weeks. Multiple feeder designs are suggested.

$10 - $20 per group Ages 6 - 14 1 to 4 weeks
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Exponga estos pósteres en el salón o déjelos donde los chicos los puedan explorar. Los chicos buscan las respuestas en libros de consulta o en línea.

free Ages 6 - adult Under 5 minutes
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In this activity, learners design wind-powered cars out of simple household materials. Students have fun designing and then racing their vehicles around the room.

$1 - $5 per student Ages 6 - 11 30 to 45 minutes