These portals will connect you to a few more of the infinite possibilities populating the multiverse—and a few impossibilities, as well.

I don't frequently write stories that lack connection to a larger universe, but here are a few:

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One of them is "Recidivism." It appeared in So It Begins

 

Another, more recent story appears in Going Interstellar:

Travelling between the stars at slower than light speeds, and based on some reasonable extrapolation of current theoretical engineering limits: that was the theme of Going Interstellar. My contribution, "Lesser Beings," takes a hard sf approach and resolves with a rather unusual social spin on the notion of what constitutes a "successful" voyage to another star.