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Why/how does rubbing alcohol kill 99.9% of all germs and bacteria? And if it kills so much, how come it doesn't hurt us and our skin?

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what happens biologically for allergies to come about?

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How does a microchip rewire the brain and how does it change the production of brain cells?

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How does meiosis occur in twins? Both identical and fraternal?

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Why are scabs so itchy? Like isn't that a counterproductive response because if we scratch at the scab then it just takes even longer to heal, so why does our body make us want to scratch it so bad?

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How do tattoos work and why are they permanent? Like why isn't your body able to push the ink back out or heal over top of it or whatever?

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Why don't rain drops feel heavy or like crack peoples skulls open when they fall on someone? I heard in a video that if you drop a penny from the top of the empire state building it has enough force to crack someones head open, so why do rain drops feel so light when they drop from heights even higher than the empire state building?

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How does sunscreen work to actually protect the skin from UV damage.

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are thyroid disorders like this usually genetic or just random?

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Okay so you know how with medieval royal families there was like a lot of inbreeding and marrying their cousins and stuff and that would lead to a bunch of deformities and the presence of recessive genetic conditions? So do animals out in the wild somehow just instinctively know not to breed within their family or cousins or whatever, or does it just not genetically work the same for them?

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What happens to your brain during electric shock therapy and how does it work?

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what don't robot voices sound human and what enables humans to distinguish human and robot voices?

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why is there no longer different species of humans? What happened to the other species?

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why does the slash and burn technique work the Native Americans used work? Why does burning replenish soil? Why does this also work when land has been demolished by lava (for example islands in Hawaii)?

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can there possibly be alternate universes where certain elements that exist in our universe don't exist there? like another universe might be missing carbon