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From the Internet to Outer Space
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In this activity, learners will use Google Sky to observe features of the night sky and share their observations.

Public Key Encryption: Kid Krypto
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In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

Battleships: Searching Algorithms
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This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

Twenty Guesses: Information Theory
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This activity introduces the idea that computer scientists measure information by how "surprising" a message is.

The Muddy City: Minimal Spanning Trees
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In this puzzle, learners investigate the decisions involved in linking a network between houses in a muddy city.

Phylogenetics
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This activity lets learners participate in the process of reconstructing a phylogenetic tree and introduces them to several core bioinformatics concepts, particularly in relation to evolution.

Divide and Conquer: Santa's Dirty Socks
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This activity introduces the idea of "divide and conquer" using a fictitious but serious problem--a pair of dirty socks has accidentally been wrapped in one of the presents that Santa is about to deli

Artificial Intelligence: The Intelligent Piece of Paper
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This activity explores what it means for a computer to be intelligent and introduces the topic of what a computer program is and how everything computers do simply involves following instructions writ

Ice Roads: Steiner Trees
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In this outdoor activity, learners use pegs (like tent pegs) and string or elastic to simulate drill sites and roads in Northern Canada.

What am I?
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In this activity, learners examine nanoscale structures of common things.

Cryptographic Protocols: The Peruvian Coin Flip
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This activity about cryptographic techniques illustrates how to accomplish a simple, but nevertheless seemingly impossible task—making a fair, random choice by flipping a coin between two people who d

Unlocking the Secret in Product Codes
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In this activity, learners will explore how product barcodes are scanned accurately and be able to "guess" the last number in a 13 digit barcode correctly every time.

The Turing Test: Conversations with Computers
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This activity aims to stimulate discussion on the question of whether computers can exhibit “intelligence,” or are ever likely to do so in the future.

Information Hiding: Sharing Secrets
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This activity about cryptographic techniques illustrates a situation where information is shared, and yet none of it is revealed.

Passion for Pixels
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In this technology activity, learners explore digital imaging and pixels. Learners "transmit" an image to a partner by creating an image on grid paper.

Sound Representation: Modems Unplugged
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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.

Binary Code Bracelets
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In this activity, learners make their own binary code bracelets by translating their initials into 0s and 1s represented by beads of 2 different colors.

EEEEK--A Mouse!
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In this activity, learners explore the concept of how engineering solved the problem of human/computer interface.

Program a Friend
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In this activity (on page 2), one person "programs" the other like a robot to move through a space, trying to get them to avoid obstacles and reach a goal.

Card Flip Magic: Error Detection & Correction
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This magic trick is based on how computers detect and correct data errors.