2. Robots

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While we once may have snickered at this notion, these days researchers and scientists are becoming increasingly concerned about the advances being made with AI, or artificial intelligence. Some of them speculate that we’ll be able to create machines that are smarter than we are some day. Combine that with robot technology and you might begin to worry that a generation of super-smart robots might not like the idea of having us humans hanging around cluttering up the planet.