Which of the following major technological achievements did not occur at the end of the twentieth century?

Name: Which of the following major technological achievements did not occur at the end of the twentieth century?
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Question

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The Superconducting Super Collider was never completed. The SSC was meant to be the world's largest particle accelerator by many degrees of magnitude, but after ten years of work the projected cost ballooned from $4 billion to over $12 billion and was canceled.

Which of the Following Major Technological Achievements Did Not Occur