Edge of Time | 
pickScientists create a miniature, self-contained universe and it... leaks, I guess? Regardless, I like sci-fi that starts out grounded in our current day-to-day and slowly eases the reader into the more fantastical elements, and that's exactly what we have here. It's smart and thought-provoking and barely feels dated at all despite its 1958 publication date. Absolutely recommended.
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