Agree:

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Stephen Hawking British physicist

The primitive forms of artificial intelligence developed so far have already proved very useful, but I fear the consequences of creating something that can match or surpass humans.
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Max Tegmark Professor at MIT & co-founder at Future of Life Institute

Superintelligent machines are quite feasible
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Frank Wilczek Physicist, MIT and Recipient, 2004 Nobel Prize in Physics

Without careful restraint and tact, researchers could wake up to discover they've enabled the creation of armies of powerful, clever, vicious paranoiacs
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Marcus Hutter Professor in the Research School of Computer Science at Australian National University

Way before the singularity, even when setting up a virtual society in our imagine, there are likely some immediate difference, for example that the value of an individual life suddenly drops, with drastic consequences.
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K. Eric Drexler Founding father of nanotechnology

AI technologies may reach thethreshold of rapid, open-ended, recursive improvement before we are prepared to manage the challenges posed by the emergence superintelligent AI agents.

Biased? Please add more opinions