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Body, brain, psychology.
Your brain makes up about 2% of your body weight but burns roughly 20% of your daily energy β even when you're doing absolutely nothing.
Learn more βYour heart has its own built-in pacemaker and can keep a rhythm even when it's disconnected from your brain and the rest of your body.
Learn more βThe longest documented case of hiccups lasted nearly seven decades β and it started over something completely trivial.
Learn more βWhere the optic nerve exits the retina, there are zero light receptors β your brain just paints over the gap.
Learn more βFingernails grow roughly two to three times faster than toenails, and the gap has puzzled researchers for decades.
Learn more βHuman cells emit a tiny amount of visible light as a byproduct of metabolism β you're glowing right now.
Learn more βBone tissue is constantly broken down and rebuilt β your entire skeleton renews itself on a cycle of several years to over a decade.
Learn more βHearing laughter activates the smiling regions of your brain before you've consciously judged whether anything is actually funny.
Learn more βBrain tissue has no pain receptors at all β which is exactly why neurosurgeons can operate on a fully awake patient.
Learn more βWhat we call "taste" is mostly smell, detected through the back of the throat β your tongue alone only picks up a handful of basic sensations.
Learn more βHuman memory doesn't work like a video recording β every time you recall a memory, you slightly distort it and save over the original.
Learn more βDuring every blink, your brain actively suppresses vision, so the world never seems to "cut out" β even though your eyes are physically closed.
Learn more βThe enteric nervous system packs hundreds of millions of neurons and can operate independently of the brain β which is why it's called the "second brain."
Learn more βStudies on so-called open-label placebos show that the mere ritual of taking an "empty" pill can genuinely ease symptoms, even when the patient is fully aware there's no drug in it.
Learn more βProprioception is the sense of your own body's position in space, working without any help from your eyes β it's how you know where your limbs are, even without looking at them.
Learn more βContagious yawning is likely tied to social empathy β and simply reading the word "yawn" can be enough to trigger one.
Learn more βDuring REM sleep, the brain actively blocks signals to your muscles so your body doesn't physically act out whatever's happening in your dreams.
Learn more βPeople with low competence in a field often overestimate their own skill the most, simply because they lack the knowledge needed to spot their own gaps.
Learn more βThe epidermis is constantly flaking off and renewing itself β your entire outer skin layer turns over roughly once a month.
Learn more βUnlike vision or hearing, your sense of time has no single dedicated sense organ β your brain builds it from multiple clues at once.
Learn more βThe human liver has a regenerative ability unmatched by any other major organ β even after losing most of its mass, it can rebuild itself back to nearly full size.
Learn more βAfter a limb is amputated, the brain can still generate real, severe pain in the exact spot where that limb used to be.
Learn more β