Browse our complete collection of questions and answers.
Probably not in the way the story tells it — he died of peritonitis following a ruptured appendix, and whether the blows caused it or merely coincided with an illness already underway has never been
The overwhelming scholarly consensus is yes — and the authorship question persists not because the evidence is thin but because the evidence is of a kind that disappoints people who expect a genius
Yes — though the popular image of a man who heard nothing at all for his entire career compresses a gradual decline over some twenty-five years into a single dramatic fact. What the evidence shows.
Because it was grown in conditions you cannot reproduce, and what you bought was a plant at an artificial peak rather than a plant in a stable state. What commercial growing does to a plant: Ideal
Joining part of one plant onto another so they grow as a single individual — the scion supplying the top growth and the rootstock supplying the roots. It works because plants can heal a wound between
It detects gravity using falling starch grains inside specialised cells — a mechanism that works regardless of light, soil depth or which way up the seed happened to land, which is why planting
Mostly because of day length, which is the only environmental signal reliable enough to time a life cycle by — temperature varies wildly from year to year, but the length of the night on a given date
The damage is done by ice forming in the wrong place, and the difference between a plant that survives a hard frost and one that turns to mush is mostly about where the ice forms rather than how cold
Pollen has to physically reach the stigma of a compatible flower, germinate, and grow a tube down to the ovule — and almost everything about how a flower looks and smells is an adaptation to getting
Rather more than aerate it. Worms are physical engineers, chemical processors and distributors of organic matter, and the effects compound over years. The three groups, which do different jobs. This
Because microorganisms are respiring — breaking down organic matter and releasing energy as heat, exactly as your own metabolism does, but concentrated in a mass large enough that the heat cannot
Water is not pumped — it is pulled up the plant by evaporation from the leaves, and wilting is what happens when that pull outruns the supply. The mechanism, working from the top down: Transpiration.
It redirects growth rather than simply removing material — and understanding the mechanism is what turns pruning from guesswork into something predictable. The central principle: apical dominance.
A flood plain is the flat land beside a river that the river floods — not occasionally and unluckily, but as its normal behaviour over geological time. Flooding is getting worse because of what has
A network of insulated pipes carrying hot water from a central source to many buildings, replacing individual boilers. It is efficient not because the heat is better but because scale unlocks heat
Most of it is far less dramatic than the word suggests, and the genuinely difficult fraction is small in volume, enormous in longevity, and currently stored rather than permanently disposed of in
From a small number of countries and a smaller number of processing facilities — and the impacts are real, geographically concentrated, and substantially smaller per unit of energy delivered than the
An area of sea where human activity is restricted for conservation. They work when they are genuinely protected, enforced, and large enough — and a great many are none of those things, which is why
Because the problem is energy density, and no alternative currently matches jet fuel closely enough for long flights — which is why aviation is one of the genuinely hard sectors rather than a matter
From rivers, reservoirs or underground aquifers, through a treatment sequence that has changed remarkably little in principle for a century — and which is among the largest public health
Most of both is recyclable, and the awkward parts — blade composites and laminated solar glass — are the ones that genuinely are not yet handled well at scale. Wind turbines. Around 85–90% of a
Capturing carbon dioxide and putting it underground permanently. The technology demonstrably works; the contested questions are cost, scale, and whether its availability delays cutting emissions in
By matching generation to demand continuously, because electricity is consumed at the instant it is produced and the grid stores essentially none of it. The balance is visible in a single number:
Spatial computing means interfaces that operate in three-dimensional space around you rather than on a flat screen — headsets, passthrough mixed reality, hand and eye tracking. The technology works
The future cost of a shortcut taken now — the extra work created when code is written to be delivered rather than to be maintained. The metaphor is deliberate: like financial debt, it can be a
Far less automatically than people assume. Most accounts are licences to use a service, not property, and access is governed by the provider's terms rather than by your will — which is why planning
Processing data near where it is produced rather than sending it to a distant data centre — a response to the fact that some problems are not solved by more bandwidth, because the constraint is
A mathematical guarantee that the output of an analysis reveals almost nothing about any single individual in the data — achieved by adding carefully calibrated random noise, and notable for being
By converting a face into a numerical vector and comparing distances between vectors — not by matching pictures, which is the misconception underlying most public discussion of it. The pipeline:
Through near-field communication, a short-range radio standard where the terminal powers the card and exchanges a few messages — and the security model is considerably stronger than the convenience
Your device does not transmit anything. It listens to signals from satellites and works out its own position from the tiny differences in how long each signal took to arrive — which makes it a
A fundamentally different model of computation using qubits rather than bits — and its realistic near-term applications are far narrower than the coverage suggests. It is not a faster computer; it is
By using two mathematically related keys where one encrypts and only the other decrypts — which solves the problem that had blocked secure communication for centuries: how to agree a secret with
Because of whether a material has electrons free to move, which in turn depends on how its atoms share them — and the answer is genuinely quantum-mechanical rather than a matter of how tightly
Because the waves are bunched up ahead of the source and stretched out behind it — the Doppler effect, which is one of the few pieces of physics you can hear directly. The mechanism. A siren emits
From several independent lines of evidence that agree, the first and most direct being that almost every distant galaxy is moving away from us, faster the further away it is. The original
Almost entirely from earthquakes. Seismic waves travel through the planet and arrive at stations around the world subtly changed by everything they passed through, which makes the Earth its own
No. It is one of the most thoroughly disproved claims in popular science, and essentially every line of evidence contradicts it. What the evidence shows: Imaging. Functional MRI and PET scans show
Not in your sink, no. The Coriolis effect is real and genuinely does act in opposite directions in the two hemispheres — but it is far too weak to determine which way a basin drains. What the
Three properties, all following from the fact that laser light is produced by a coordinated process rather than a chaotic one: it is a single colour, the waves are in step, and the beam barely
It does not make cold — it moves heat, pumping it from inside the cabinet to the room, which is why the back of a fridge is warm and why leaving the door open heats a kitchen rather than cooling it.
By shaking water molecules with an oscillating electric field — not, as the common explanation has it, by hitting some special resonant frequency of water. The actual mechanism. A water molecule is
Magnetism comes from electrons, and specifically from a quantum property called spin — the everyday picture of a magnet as containing tiny arrows is closer to correct than most simplifications,
A trained, impartial mediator helps people in dispute reach their own agreement. It is not therapy, not arbitration, and not legal advice — the mediator has no power to decide anything, which is the
Because there is frequently no objective standard available, and comparison is how the mind establishes where it stands. It is an automatic evaluative process rather than a character flaw — which
The findings are more nuanced than either the disapproving or the dismissive position suggests: large gaps are associated with somewhat worse average outcomes, the effect is modest, and the
There is some real evidence behind the idea, and it is much weaker and much less mystical than the popular version — which treats it as a psychological compulsion to recreate childhood. What the
Far less than you think, and specifically rather than generally — the most common failure is not saying the wrong thing but saying nothing at all, out of fear of getting it wrong. What generally
Because political positions have increasingly become markers of identity and moral character rather than policy preferences — so disagreement reads as a statement about who you are, not about what
More disruption than most couples anticipate, because retirement changes time, territory, identity, money and the division of labour simultaneously — and the transition is frequently harder than the