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Michio Kaku is a "scientist" but most of his ideas are fanciful fictions. Thought experiments are absolutely critical to conjuring hypotheses but "scientists" qualify and temper hypotheses and are not sensationalist alarmist or aggrandizing without evidence
I've been a full-time research scientist almost my whole career. Productive scientists are all over the map in comfort with speculation. I. J. Good was an excellent scientist who was also comfortable with speculation, thus superintelligence (Bostrom is riffing off Good).
Speculation is not just OK it is NECESSARY. But if it is untestable it is not science Eg. I believe the greatest threats to humanity is runaway perfume molecules. Synthetically produced, held captive, bottled. When released at a critical mass over time they will self organize...
Lots of ideas go from speculative to being testable. Wish I had a dollar for every physicist who told me in the 90s that quantum computers were ridiculous fiction. It's clear now they were all wrong. We may do a similar test for superintelligence. Pointing out that it's
Altering not just envrionments but humanity itself. None of this is perceptible at small dilute concentrations but at some Critical Mass Point in next 25-85 years, self assembly of giant clouds of volatile organic compounds will cast an irremovable cloud over humanity. Disprove.
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