Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
303 | AMA | February 2025
Sean Carroll
Even if that doesn't happen, the protons in your barrier could decay themselves, and that would be bad. So it's hard to imagine truly impermeable barriers. It's also hard to imagine small toy universes a few meters in diameter for exactly the reason that Einstein was shocked back in 1917 when he started thinking about cosmology. And he realized that in general relativity,
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