Susanne invented a time chamber. It was too risky to jump far into the future because she had no idea if the chamber would exist to receive her, also making pre-chamber travel impossible.
She jumped forward and witnessed a global catastrophe likely to cause humanity's extinction.
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She had to protect the chamber for her future self's arrival and return to prevent a paradox.
She sat at the dinner table with her wife, April, and her teenage daughter, Jennifer.
"Susanne, is something bothering you?" asked April.
"Only something I've realized …"
"Which is?" asked Jennifer.
"Time travel," Susanne sighed, "really sucks."