So, some scientists have made thumb-sized squid transparent. Apparently it's hard to find them in the aquarium now. But the point is to observe their biology while they get to live their little squid lives. Technically, they're albino squid, but because of the way cephalopods work...
One of the key study areas is the brain. Squid have pretty large brains, which is why I stopped eating calamari. Injecting fluorescent dye into the brain causes areas of it to light up. For example, they inject fluorescent die into the squid's visual cortex then show it pictures.
We're hoping this will give us knowledge about how all brains work, including ours.
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