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The brain itself has no pain receptors. That's why an 'aw... | funfact.wiki | funfact.wiki
The brain itself has no pain receptors. That's why an 'awake craniotomy' works — surgeons numb only the scalp and skull, and the patient stays conscious. Doctors have them talk or move a hand mid-surgery, mapping speech and motor areas in real time to avoid damaging them.
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Purple does not exist in the light spectrum. When red and blue light simultaneously stimulate the eye, the brain creates this color to resolve the contradictory signals.
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The urge to squeeze or bite something extremely cute is a real phenomenon called "Cute Aggression." Yale University research found it's a defense mechanism: the brain generates slight negative emotions to counterbalance overwhelming positive feelings — similar to crying tears of joy.
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You can't tickle yourself because your brain predicts outcomes of your own actions and ignores matching sensations. However, schizophrenia patients — whose prediction systems are impaired — can indeed tickle themselves.
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The brain of a cephalopod is shaped like a donut, with the esophagus running straight through the center. Even in a 300 kg colossal squid, the esophagus is only about 10 mm in diameter—so swallowing too large a piece of food can compress the brain and cause damage.
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An octopus has roughly 500 million neurons, and more than two-thirds of them are distributed across its eight arms rather than its central brain. The brain issues high-level commands while each arm independently handles the details—a decentralized nervous system.
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