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There are enough loose threads to suggest a second season was on Keller’s mind from the beginning — well, that’s TV, isn’t it? — but should that not come to pass, the arc this season completes is perfectly satisfying; not every open question needs to be answered, and my affection for the characters is such that I fear the troubles a second season will necessarily cook up for them.

"Whether it's a strategy that's going to work is very much an open question."

There seems to be a consensus among both state and local officials that the neighborhood should remain closed to the public, though the logistics of that decision remain an open question.

But how exactly the water flowed is an open question.

Whether we should see this as a neat bit of symbolism about de-extinction or a defiant, stubborn reference to industries that ought to have died out long ago is an open question.