Technology explainers

How Do Gallium Nitride Power Transistors Handle High Voltage?

Gallium nitride’s wide bandgap and high critical electric field allow a power transistor to block high voltage with a thinner, lower-resistance region than silicon. Field crowding, defects, heat, contacts, packaging and long-term reliability determine whether that material advantage becomes a useful converter.

Why Use Living Insects Instead of Tiny Rescue Robots?

Biohybrid rescue systems use an insect’s muscles, balance, reflexes and metabolism as the mobile platform, then add steering electrodes, sensors and communication. They can cross rubble that challenges miniature robots, but control, payload, communication, welfare and field reliability remain major limits.

How Can Coral Reveal El Niño Events From Centuries Ago?

Massive corals build dated skeletal layers whose strontium-to-calcium ratios and oxygen isotopes respond to sea temperature and water chemistry. Calibrated, replicated records can reconstruct past El Niño variability, but biological effects, dating gaps and local ocean changes create uncertainty.

Can an AI Company Refuse Certain Military Uses of Its Model?

An AI supplier can reject proposed military work or negotiate limits before signing. After deployment, the contract, hosting model, procurement law and technical controls determine who can restrict use, suspend access or demand continuity.

How Can Online Platforms Estimate a User’s Age?

Platforms can assess age through self-declaration, documents, trusted records, facial estimation, behavioural signals or privacy-preserving credentials. Good systems match the method to the risk, measure threshold errors, minimize data and provide an alternative and appeal.

How Do Underground Experiments Search for Dark Matter?

Underground detectors wait for a rare atomic recoil, measure it through heat, charge or light, and reject cosmic rays, radioactivity and instrument noise before testing whether any excess fits a dark matter model.

How Do RAS Inhibitors Block Cancer Growth Signals?

RAS proteins are timed molecular switches that cancer mutations can jam in the active state. RAS inhibitors either trap a particular mutant form, block active RAS from passing its signal, or weaken the surrounding pathway, but tumour biology and resistance determine how long control lasts.

How Do Proxy Botnets Hide the Source of Cyberattacks?

Proxy botnets relay malicious traffic through compromised routers and other devices, making the final relay appear to be the source. Their scale and ordinary-looking addresses frustrate simple blocking, but control infrastructure, timing, malware, and repeated behavior can still expose the operation.

How Does an Electronic Nose Identify a Smell?

An electronic nose samples air with an array of cross-reactive chemical sensors, converts their changing responses into a fingerprint, and compares it with learned reference patterns. It can classify a defined odor or condition quickly, but humidity, mixtures, sensor drift, weak training data, and unfamiliar chemicals can undermine the result.

How Does Hot Isostatic Pressing Turn Metal Powder Into a Solid Part?

Hot isostatic pressing seals metal powder inside a shaped container, then uses heat and uniform inert-gas pressure to collapse pores and bond the particles below their melting point. The result can approach full density, but powder cleanliness, capsule design, shrinkage, inspection, and qualification remain decisive.

How Do Humanoid Robots Keep Their Balance While Running?

A running humanoid repeatedly estimates its posture and momentum, predicts future foot contacts, and commands whole-body forces before its motion becomes unrecoverable. Fast sprinting proves a narrow capability, while safe stopping, disturbance recovery, payload handling, endurance, and repeatability determine real-world usefulness.

Why Do Electric Motors Need Soft Magnetic Materials?

Soft magnetic cores concentrate and redirect changing magnetic flux through an electric motor while reversing magnetisation with little energy loss. Efficient designs balance permeability, low hysteresis, electrical resistance, saturation, mechanical strength, geometry, frequency, manufacturability, and cost.

How Does Haptic Feedback Help People Control Machines From Afar?

Haptic teleoperation sends human motion toward a remote machine and reconstructs selected contact forces, vibration, or pressure at the operator’s interface. The added physical channel can improve control when vision is ambiguous, but delay, scaling, instability, poor calibration, and unsafe failure behaviour can make it misleading.

How a Rocket Lands Itself After Launch

A returning rocket booster separates, turns, manages its energy through engine burns and atmospheric drag, steers toward a recovery target, and times a final burn to cancel its remaining velocity. Landing proves controlled recovery, but repeated reflights, manageable refurbishment, payload economics, and safe operations establish true reusability.

How Multi-Turn Attacks Manipulate AI Agents

Multi-turn attacks conceal one prohibited objective across a sequence of requests that may appear acceptable in isolation. Defending tool-using agents requires tracking cumulative intent, state, permissions, and action consequences across the entire workflow without blocking legitimate multi-step work.

Why Do Early Supermassive Black Holes Puzzle Astronomers?

Some black holes appear to reach millions or billions of solar masses within the universe’s first billion years, leaving little time for a seed to form and grow against radiation and feedback. Possible answers include heavier seeds, rapid accretion, mergers, obscured growth, and revised mass estimates, but each must match the observed population.

Why Doesn't a Correlation Between Two Things Mean One Causes the Other?

Correlation describes variables moving together; causation predicts what would change under an intervention. Reverse causation, confounding, selection, measurement, and chance can create associations, so causal confidence depends on study design, credible comparisons, time order, replication, and converging evidence.

What Actually Makes a Plastic Biodegradable?

A plastic is biodegradable only when microorganisms convert its polymer carbon into biomass and metabolic products under defined conditions and time, not when it merely fragments or dissolves. Polymer chemistry, product thickness, microbes, temperature, moisture, oxygen, certification boundaries, and the available waste system determine the real outcome.

Why Is There More Matter Than Antimatter in the Universe?

A tiny excess of matter survived early-universe annihilation and became everything we see. This explainer unpacks the evidence, Sakharov conditions, leading baryogenesis ideas, and experiments that could reveal the cause.

What Is Dark Matter, and How Do Scientists Search for It?

Dark matter is an unseen gravitating component inferred from galaxy motion, lensing, colliding clusters, the cosmic microwave background, and structure formation. Its physical identity remains unknown, so scientists test particle and compact-object candidates through underground detectors, telescopes, accelerators, precision sensors, and astronomical maps.