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Small-Scale Question Sunday for February 18, 2024

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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A couple I know is doing IVF. They have the embryos already but they aren't implanted. I suggested they select the one to implant using genetic testing which a few companies offer at wildly varying costs. Does it really work? Are there downsides? If it can do what's advertised, it would seem to be worth the cost, which is several thousand dollars at most.

I would like to know the answer to this as well.