Time Travel Bridge

So it became clear to me that if time travel was to become possible, it required a two way bridge to be created, and thus I had to start as soon as possible.

It took me a dozen years, but I finally had a design that looked promising. So I built it and turned it on, assuming my copious notes would allow those in the future to match the needed frequencies.

And indeed, someone walked through, a man, bearded, tanned, and speaking in... Old Persian.

So apparently multiversal travel also requires a two way bridge to be built first off.