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(1999)

The first copy of this essay captured by the Internet Archive was in October of 2001: https://web.archive.org/web/20011013031756/http://wuphys.wus...

The same timestamp at the bottom of the essay can be found on other pages by Professor Katz, such as his list of publications which includes papers from 2019. I suspect that the timestamp of 1999 is incorrect.

https://web.archive.org/web/20191206233227/https://web.physi...

I was a TA for this professor in ~2000, and this article had already existed (and made the rounds of the grad student offices). I suspect that 1999 is correct.

While this is clearly an old post, I'm not sure about the actual date. On the bottom it says 1999, but there's also a citation for an article from 2001.

> For many more details consult the Young Scientists' Network or read the account in the May, 2001 issue of the Washington Monthly.

Being a physics researcher he built a time machine and in late 2001 went back in time to post it.

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