how aizawa's hair and scarf floats when his quirk activates : a scientific thread ! https://twitter.com/whoizsky/status/1325611992158187520
possibility one : you're watching an anime

/ lh
possibility two : keep reading !
it's theorized that quirks are caused by a virus which is said to have been spread by mice, but after that it's hereditary.

it's safe to assume that whatever virus this is has altered the human body in a physical level , which honestly is rather obvious looking at most quirks.
moving on, the quirk that we're looking at now is the one used by shota aizawa, the homeroom teacher for class 1-A.
the quirk being active is what activates his hair and scarf to float. i'm going to assume he wasn't born with the scarf and instead had it modified to work with his quirk.
there are only two feasible answers i can think of, to be honest. this is a hard question help
1. you know how when you get goosebumps, the hair on your skin also stands up? it's possible that his quirk can also control his hair follicles. maybe it directs the follicles up and back, or hardens his hair so it's pointed as it is.
2. some sort of weird magnetism.

this is an incredibly theoretical one that plays with the fact that in bnha, it's a world that doesn't quite follow the chemistry of our own .

following that, for his scarf, it could be that when his quirk is activated, there's +
a magnetic field that reacts solely with whatever material his scarf is made of. theoretically , an enemy could take advantage of this to a scary level , but i'm going to go out on a limb and say that horikoshi didn't think abt any of this.
unrelated but as i was searching things up i saw this
going on ....
if the scarf is a material that maybe operates on a frequency that resonates only with itself, it's possible that that's how it works? but i'm not sure how it wouldn't be activated all the time, then ....
which brings me to #3 i guess
idk why im making this thread i really don't think anyone is going to read this. if you're still here have a cute midoriya, i love you
ok 3

this sort of circulates around how erasure itself would work. it's possible that maybe aizawa emits a frequency that cancels out the quirks, and that's how it works. id have to go more in depth, but assume that i've somehow proved that quirks operate on the same frequency.
if the scarf is made out of a material that also reacts to this frequency, then maybe that's how it floats. it's also maybe possible that his hair has been threaded with those materials, or vice versa - they got the material from his hair and threaded the scarf with it
in conclusion i have no idea what the fuck im saying but aizawa is fuckin cool, check out my other science nerd threads
https://twitter.com/denkittie/status/1324756977151545345?s=19
https://twitter.com/denkittie/status/1324742361839259649?s=19
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