Cosmic Joke. Science Fiction Weekly #23: Short Reads Series
When Rosa hires Jacob to help her discover alternate realities not detectable from this universe, she hardly expects him to find a way so quickly.
But then she discovers that Jacob has been one step ahead of her the whole time. And his solution to the experiment may affect the entire human race across all of space and time.
Cosmic Joke is #23 in the Science Fiction Weekly Series. A short reads story of about 4900 words.