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What was the most important invention of the twentieth century?
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The answer is a bit complicated. There are many inventions that could be considered to have been the most important, depending on how you define “important.” For example, if you consider the impact on people’s lives, then the airplane might be the most important invention of the 20th century. If you consider the impact on society and culture, then the computer would be the most important invention. And if you consider the impact on science, then the discovery of DNA might be the most important invention.