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Sea Turtle Populations
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In this activity (on page 2 of PDF under GPS: Sea Turtles Activity), learners will model how a sea turtle population changes over time, from eggs to adults, using puffed rice.

Fair Spinners
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In this math game (Page 9 of the Are You Game? PDF), learners determine what makes a spinner fair or unfair. Learners first play a round with a pre-made spinner that isn't very fair.

Peripheral Vision
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How far can you see out of the corner of your eye? Grab a partner and find out from the Exploratorium Science Snack.
Ride on a Slide: Toys or Tubes Ride Slopes and Angles
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This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.
Look Around: Hunt For Sizes, Shapes and Numbers
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In this activity, learners will participate in a scavenger hunt involving sizes, shapes, and numbers. This activity works well with a whole group, individuals, or families.

Building Three-Dimensional (3D) Structures
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In this activity, learners practice drawing 3D structures in two dimensions. Learners draw cube stacks from five different points of view.
One-Cut Paper Stars
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Here's a very simple activity if you have paper and scissors: make one cut, unfold, and you have a beautiful star! A great way to learn about polygons and origami mathematics.

Scytale Messages
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In this activity, learners use a soda can to decode a secret message. Learners wrap scytale (pronounced ski-tally) code around a can and challenge friends to see if they can crack the codes.

Size It Up
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In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid.

Probability
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In this activity, learners will explore probability using dice. They will predict and then roll the dice to observe how many rolls it would take to repeat a matching pair. Learn track predictions vs.

Mountain Rescue Mission
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In this math activity, learners play a game that helps reinforce learners' understanding of the coordinate system.

Building an Army
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In this activity, learners explore the potential of interchangeable standard parts to create a large number of unique creations in different combinations.

Telephone Talk
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In this math activity, learners find patterns in telephone numbers.
Toothpick Patterns
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In this math activity, learners make toothpick designs by following simple patterns.
Tip Topper
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In this math activity, learners role-play as wait staff at the Kidtropolis Diner. It's the end of the night and it's time for the staff to collect their tips.

Achi: A Strange Game of Tic Tac Toe
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In this game, learners strategize to be the first player to make three in a row.

Subtracta's Dog
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In this math activity related to volume, learners use problem solving skills to calculate and build a model house for Minus the dog.

The Senses of "Unknown Creatures"
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In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.

100 Puzzles
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In this activity, learners find as many combinations of a hundred as they can using various puzzle pieces from a hundred square grid paper.

Mystery of the Disappearing Cottonwoods
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Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.