The other is chaos theory, which explains how a tiny disturbance can cascade into a large effect.

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Mr. SWIFT: Economic theory tells us that ultimately the consumer will bear the cost and those costs just cascade right through the supply chain.

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This chemical cascade, called the Wnt pathway, is turned on when organisms are injured, and it could in theory be used to make stem cells that are already present in the heart, brain and other organs regenerate damaged tissue.

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