Unknown in example sentence

With a special telescope, Dr. Janos Rukh (Boris Karloff) successfully proves that years ago a meteorite landed in Africa containing an unknown, but extremely powerful element.

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At the same time, we need to think locally, which is the joy and marvel of Sylvia's hope spot wish, is that we can shine a spotlight on many of these previously unknown areas, and to bring people to the table, if you will, to actually make them feel part of this community that truly has a stake in their future management.

But also, our hearts are in our throats a huge amount of the time, because we're driving through water, and it's an unknown territory.

Because the Koran is quite clear when it says that you'll be "a new creation in paradise," and that you will be "recreated in a form unknown to you," which seems to me a far more appealing prospect than a virgin.

And we were elated when they took a chance on a team of completely unknown investigators and funded us to study 1,000 women with dense breasts, comparing a screening mammogram to an MBI.

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