Time Travel in a 1928 Chaplin Film?

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Recently, I’ve been getting calls from the media, asking me about the 1928 Charlie Chaplin movie which shows a person talking into what appears to be a cell phone.
How can this be? Is this person a time traveler?
Let me make a few remarks:
To actually build a time machine, you need positive and negative energy on a cosmic scale. So don’t think that any inventor is going to build a time machine any time soon.
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