Looks like science fiction, but true.
Molly and Emma are genetic siblings. Emma was thawed first; Molly few years later, had been frozen for 27 years.
Picture of the girls: https://www.zerohedge.com/s3/files/inline-images/molly%20emma.PNG?itok=EDyreJmh
Following URL gives some details: https://www.zerohedge.com/political/knoxville-embryo-reanimated-after-quarter-century-record-breaking-live-birth
A few cells, soon after fertilization, is frozen: can be frozen for 27 years: care and a womb can result in a healthy baby.
What happens with the unused frozen embryos?
My vector to the URL started at Voat.co
A plot for FICTION, a sci-fi story, with motivation similar to 'Hanna', or 'Soldier', or 'Boys from Brazil':
In the story, the following is done by the hundreds or thousands, concurrently:
1. Produce twins by the thousands soon after fertilization during 'cleavage' period;
2. freeze all but one which is developed to birth then adulthood;
3. for any selected adult, there exists thousands of twins.
Ethical question: what happens to the unused embryos?