Just a little humor

"And if there are any time travelers out there you're invited to a party at my house - date is last week." #1,742
Alright. BUT !

Even if their time machine has both forward and reverse, that does not necessarily mean they'll coincide with the 4 dimensional requirements to see / read the invitation. They may have time-traveled on the other side of the street.

On the broader point:

Absence of evidence is not [conclusive] evidence of absence. SETI slogan

"Lack of proof is proof of nothing." epyon106


It's unlikely there are time travelers from our past, unless from before the big bang, or from a different planet / technological culture.
So if there are time travelers, they're probably from our future.
In that, or any other case, where are they?
Their apparent absence suggests they don't exist.

Time travel has substantial appeal in fiction.
So does the notion that a blow to the head reliably induces temporary harmless unconsciousness.
It causes head trauma.

We KNOW time travel is possible. We've already done it. Calculation indicates the NASA Apollo astronauts that orbited the moon are a few minutes younger than they would have been if they'd stayed on Earth. BUT !
The notion that we will ever navigate time as we do space is likely to be fantasy.
 
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