"Siri, call 911!"
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(dies)
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Did you say, Call nine won won?
Naw I kid, Siri is pretty cool. I used microsofts voice recognition, trained it, etc for a while and even after 2 months of use it still made a LOT of mistakes. Siri, on day one, knew nearly everything I said.
Voice recognition existed far before Siri, but Siri is pretty damn good at understanding. Even understands my old mans heavy french accent.