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Kathryn was always intrigued by the woman Chris talked about; a genius scientist, a big heart, young and raw but with almost boundless potential, the way he described her. Now suddenly she's here, a little older and wiser, but still a live wire, still in love with science, still able to light up a room with her smile despite all she's seen and lost.
It makes Kathryn feel more equal to... well, everything. At least she still has a home to return to, family, loved ones. Tilly's out of time, twice; that sounds lonelier by far than seventy thousand lightyears.