The questions people keep asking, properly answered.
Not a search engine. Curio collects the curiosity that keeps resurfacing across the internet, checks it against real sources, and explains it from plain intuition down to expert detail.
Not a search engine. Curio collects the curiosity that keeps resurfacing across the internet, checks it against real sources, and explains it from plain intuition down to expert detail.
Questions the platform found interesting since yesterday
Sharp corners concentrate stress into a single point, and at cruising altitude a pressurised cabin pushes hard enough on that point to tear the fuselage open.
Every charge cycle drives slow side reactions that permanently consume lithium and thicken an insulating film on the electrodes, so a little capacity is lost each time and never comes back.
Most digital cameras do not capture the whole image at one instant — they scan it line by line from top to bottom, so anything moving fast is recorded at a slightly different position in every row.
The message that money is coming arrives in seconds, but the banks only actually exchange the money in scheduled batches, and the gap between the promise and the exchange is the delay you experience.
The ticket is priced low on purpose, and the popcorn quietly charges the people who enjoy the film most — because the cinema keeps almost all of the popcorn money and only a fraction of the ticket.
A bruise is blood spilt under the skin, and the colours are the stages your body's clean-up crew takes it apart in.
Because you are not comparing 23 birthdays against 365 days — you are comparing 253 pairs of people against each other, and 253 chances at a 1-in-365 event is a coin flip.
Main memory is so slow relative to a modern processor that without a small, very fast copy of recently used data sitting next to the core, the processor would spend most of its life waiting.
The curiosity that keeps resurfacing, everywhere, for years
Air molecules scatter short-wavelength light far more strongly than long-wavelength light, so blue arrives at your eye from every direction of the sky while red passes straight through.
They are not beyond gravity — they are falling, continuously, and so is their spacecraft, so nothing pushes back against them.
The limit is not about light — it is the maximum speed at which any cause can reach any effect, and light simply happens to travel at it.
Your brain predicts the sensations your own movements will produce and quietly turns them down, so a self-administered tickle arrives already expected and therefore not ticklish.
They are built to produce text that fits, not text that is true, and a fluent invention fits just as well as a fact.
Because you judge elapsed time largely by how much you remember of it, and a familiar year lays down far fewer distinct memories than a novel one.
Because the notation does not mean a number creeping toward one — it means the value the sequence of finite pieces converges to, and that value is exactly one.
One tenth cannot be written exactly in binary, any more than one third can be written exactly in decimal — so the computer stores a very close approximation and the small errors show up when you add them.
Widely misunderstood, and usually explained badly
They are not beyond gravity — they are falling, continuously, and so is their spacecraft, so nothing pushes back against them.
They are built to produce text that fits, not text that is true, and a fluent invention fits just as well as a fact.
Because the notation does not mean a number creeping toward one — it means the value the sequence of finite pieces converges to, and that value is exactly one.
Electricity only flows when there is a voltage difference across something, and a bird touching one wire has both feet at the same voltage, so there is nothing to push current through it.
Because babies everywhere babble the same easiest sounds first, and adults everywhere hear those sounds as being about them and adopt them as words.
Because two perfectly reasonable rules for what makes something the same thing over time — continuity of matter and continuity of form — disagree, and nothing in the world settles which is right.
They do not flip left and right at all — they flip front and back, and you are the one who mentally rotates yourself to face your reflection.
They do not target carelessness — they target context, arriving at a moment when the request they make is exactly what you were expecting.
The deliberate decisions inside things you use without thinking
One tenth cannot be written exactly in binary, any more than one third can be written exactly in decimal — so the computer stores a very close approximation and the small errors show up when you add them.
They do not target carelessness — they target context, arriving at a moment when the request they make is exactly what you were expecting.
A well-built site never stored your password in the first place — only a one-way scramble of it, which can be checked against but cannot be turned back.
It was designed around the mechanical constraints of a machine nobody uses any more, and it survived because everyone had already learned it.
Because building one stiff enough not to sway would be absurdly expensive and no safer — swaying is how a tall building sheds wind energy instead of resisting all of it.
Sharp corners concentrate stress into a single point, and at cruising altitude a pressurised cabin pushes hard enough on that point to tear the fuselage open.
The web was designed to forget you between every click, so a cookie is the note the site hands you to carry back, because it has no other way to know you are the same person.
Making the ends of the car fold on impact stretches the crash over a longer moment, and a longer moment means a smaller force on the people inside.
The physics and biology of an ordinary afternoon
Air molecules scatter short-wavelength light far more strongly than long-wavelength light, so blue arrives at your eye from every direction of the sky while red passes straight through.
The limit is not about light — it is the maximum speed at which any cause can reach any effect, and light simply happens to travel at it.
Your brain predicts the sensations your own movements will produce and quietly turns them down, so a self-administered tickle arrives already expected and therefore not ticklish.
Because you judge elapsed time largely by how much you remember of it, and a familiar year lays down far fewer distinct memories than a novel one.
Electricity only flows when there is a voltage difference across something, and a bird touching one wire has both feet at the same voltage, so there is nothing to push current through it.
They do not flip left and right at all — they flip front and back, and you are the one who mentally rotates yourself to face your reflection.
A tiny muscle at the base of every hair yanks the hair upright when you are cold or startled — useful if you are covered in fur, and left over in us because we are not.
Cutting the onion mixes two chemicals it kept apart, and the reaction makes a volatile gas that turns mildly acidic on the wet surface of your eye.
Chosen for how satisfying the answer turns out to be
Because you are not comparing 23 birthdays against 365 days — you are comparing 253 pairs of people against each other, and 253 chances at a 1-in-365 event is a coin flip.
Division asks what you must multiply by to get back where you started, and multiplying by zero destroys that information — so the question either has no answer or has every answer.
A year is not a whole number of days, so the calendar has to be given an extra day now and then or the seasons slowly drift away from the dates.
A well-built site never stored your password in the first place — only a one-way scramble of it, which can be checked against but cannot be turned back.
The oil is hotter than boiling water by hundreds of degrees, so the water flashes into steam instantly and blasts the burning oil upward and outward as a fireball.
Antibiotics attack machinery that bacteria have and viruses do not — and a cold is a virus, which has almost no machinery of its own to attack.
Freezing forces water molecules into an open framework with gaps in it, so the same molecules take up about a tenth more room as ice than as liquid.
Making the ends of the car fold on impact stretches the crash over a longer moment, and a longer moment means a smaller force on the people inside.
Short, complete, self-contained
Because babies everywhere babble the same easiest sounds first, and adults everywhere hear those sounds as being about them and adopt them as words.
The oil is hotter than boiling water by hundreds of degrees, so the water flashes into steam instantly and blasts the burning oil upward and outward as a fireball.
A tiny muscle at the base of every hair yanks the hair upright when you are cold or startled — useful if you are covered in fur, and left over in us because we are not.
Cutting the onion mixes two chemicals it kept apart, and the reaction makes a volatile gas that turns mildly acidic on the wet surface of your eye.
The cabin is drier than a desert and pressurised to a mountain altitude, which dulls your sense of smell — and constant loud noise suppresses sweetness on top of it.
Division asks what you must multiply by to get back where you started, and multiplying by zero destroys that information — so the question either has no answer or has every answer.
It was designed around the mechanical constraints of a machine nobody uses any more, and it survived because everyone had already learned it.
Left was the older custom across much of the world, and the countries that changed did so because of specific historical pressures — mainly Napoleon, and later the pull of neighbours and American vehicles.
Being read far more than usual this week
Raising the price of borrowing makes spending and investment less attractive today, which cools demand — and the central bank is deliberately slowing the economy because it has no direct lever on prices.
Every charge cycle drives slow side reactions that permanently consume lithium and thicken an insulating film on the electrodes, so a little capacity is lost each time and never comes back.
Main memory is so slow relative to a modern processor that without a small, very fast copy of recently used data sitting next to the core, the processor would spend most of its life waiting.
The web was designed to forget you between every click, so a cookie is the note the site hands you to carry back, because it has no other way to know you are the same person.
No algorithm, no reason — just something unexpected
The web was designed to forget you between every click, so a cookie is the note the site hands you to carry back, because it has no other way to know you are the same person.
Walls absorb and reflect part of the radio signal, and rather than simply arriving quieter, a weakened signal makes your router switch to a slower, more repetitive way of encoding data so it can still be understood.
Left was the older custom across much of the world, and the countries that changed did so because of specific historical pressures — mainly Napoleon, and later the pull of neighbours and American vehicles.
Your brain predicts the sensations your own movements will produce and quietly turns them down, so a self-administered tickle arrives already expected and therefore not ticklish.
Sharp corners concentrate stress into a single point, and at cruising altitude a pressurised cabin pushes hard enough on that point to tear the fuselage open.
Sometimes it does and sometimes it does not — and after sixty years of attempts, nobody has produced an experiment that reliably shows it or a mechanism everyone accepts.
They are built to produce text that fits, not text that is true, and a fluent invention fits just as well as a fact.
Mirrors were added because complaints about slow elevators dropped sharply when people had something to look at, which was far cheaper than making the elevators faster.