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The Skyscraper Challenge
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Bad news: You just built this skyscraper in a major earthquake zone. If you don't strengthen this skyscraper before the next earthquake hits, it will whip back and forth and snap in pieces! You need to further brace this tall building before the earth moves or you're in deep trouble.

How will you strengthen your skyscraper?

 Rigid backbone with diagonal braces    Long, supporting arms    Rigid backbone with solid, concrete walls
Rigid backbone with diagonal braces   Long, supporting arms   Rigid backbone with solid, concrete walls

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