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I was in 8th grade when I learned to program.

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I first learned how to make a

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green circle and a red square appear on the screen.

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You just learn these lessons, and there aren't that many of them,

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and you just eventually can get to the point
where you can do almost anything that you want.

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Computer science is just learning 
how a computer works and how it thinks,

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so that you can teach it to do new things.

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These days what you can do in computer science 
is pretty much amazing.

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I think it's the closest thing we have to a super power.

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(Tanya: Computer Science student) In the next hour we're going to play a game

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that will teach you the basic concepts of programming.

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Usually programming is all in text but we'll use Blockly,

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which uses visual blocks that you drag and drop to write programs.

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Under the hood you're still creating code.

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To start off we're going to build code for a program that will help

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this angry bird move through a maze to get to 
the evil pig that stole its eggs.

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Blockly is split into three main parts.

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On the left is the bird's maze where your program will run.

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The instructions for each level are written below the maze.

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This middle area is the tool box,

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and each of these blocks is a
command that the bird can understand.

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The white space on the right is called the workspace

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and this is where we'll build our program.

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If I drag the "move" block to our workspace and press "run", 
what happens?

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The bird moves forward one box on the grid.

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And what if I want the bird to do something
after the move forward on one box?

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I can add another block to our program.

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I'm going to choose the "turn right" block and I'll drag it underneath

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my "move" block until the yellow arrow appears

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and then I'll drop it and the two blocks will snap together.

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When I press "run" again,
the bird will perform the commands that are stacked,

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from top to bottom, on our workspace.

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If you ever want to delete a block,

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just remove it from the stack and drag it to the trash can.

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After you've hit "run", you can always hit the
"reset" button to get the bird back to the start.

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Now, let's get those pigs!