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In January 1953, a tidal wave hit the North Sea. The titanic waves inundated the Dutch coast, killing nearly 2,000 people. Fifty-four years later, a similar storm threatened the region. But this time, they were ready. This was because of a massive interlock system known as the Delta Plan, the most sophisticated flood prevention project in the world. Stefan Al dives into this engineering marvel. Lesson by Stefan Al, animation by JodyPrody. Watch the full lesson at: https://ed.ted.com/lessons/why-isn-t-...