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Domino skyscraper

Act 1

Information is given that a smaller domino can topple a domino that is up to 1.5 times as large in every dimension. A series of dominos satisfying this condition is shown being placed ready for toppling. How many dominos would it take to knock over a skyscraper sized domino?

Act 2

A graphic gives information about the heights of skyscrapers around the world.

Act 3

A video shows the dominos from the first video being toppled.

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