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Humans can never go faster than 45mph, you'll suffocate!
You can never go faster than speed of sound!
Don't go to edge of earth, you'll fall off and die!
yada, yada, yada..
Sure with existing tech, new stuff can't happen. But you have to adopt new rules and develop new laws of physics that needs to be discovered and accepted. It's the giving up of old ideas and accepting new ones where breakthrough occurs. There is nothing in newtonian physics that can explain quantum physics and string-theory. You just have to accept the new stuff.
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