/r/askscience
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High-intensity ultrasound is being used to destroy tumors rather deep in the brain. How is this possible without damaging the tissue above?
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From the interior of the International Space Station, would you be aware you are in constant motion? Are things relatively static or do they shudder and shake like a train cabin might?
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How do magnets get their magnetic fields? How do electrons get their electric fields? How do these even get their force fields in the first place?
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