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Now that you've learned
how to use Sprite Lab,

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you're going to want to make
your program react

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when someone plays
with it.

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To do that, you're going to
use events.

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Blocks like `when clicked` and 
`while touches` are called event blocks.

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The code connected to
an event block

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runs when the approprite input,

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like a click or a tap, is detected.

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For example, if you attach this
`change size by` block

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to the `when Alien 1 clicked` event
the sprite will change size when it's clicked.

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Notice that event blocks don't snap
into your main program.

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Instead, they create 
little programs of their own.

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Remember that even if the event
only happens one time,

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behaviors will go until you stop.

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You can use a `stops` block

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if you don't want multiple events
to combine behaviors.

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Using events, you can create
imaginative programs

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and interactive worlds.

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Give it a try!