What was the significance of nuclear testing in the development of the Internet?

I don't know that it had any. The Internet was originally developed so that the US Department of Defense could communicate better with researchers working on DOD projects. I would assume some of those projects may have involved nuclear testing.

What is the significance of ARPANET in relation to the development of the Internet?

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Originally Posted by M6193

What is the significance of ARPANET in relation to the development of the Internet?

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Arpanet was the DOD initiative I referred to. It became the Internet!

You can easily find details by plugging ARPANET into your favorite search engine.