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A surprising amount, in well under a second. The sequence is one of the most useful things to understand about how the internet works. The browser checks its caches. Browser cache, then the operating
Malware is the umbrella term for any software written to cause harm. Everything else is a category within it, and the distinctions are about how it spreads or what it does. Categories by how they
Less than the advertising implies, and the honest description is narrow: a VPN encrypts traffic between your device and the VPN server, and replaces your IP address with the server's. What it
You can, and for some uses it works well — but several differences make a TV a poor desk monitor and a good living-room display, and they are not obvious from the specifications. Where TVs fall
For most people, in most listening situations, the evidence for hearing a difference above CD quality is weak — though the surrounding claims are often confused with things that genuinely do matter.
It is not a regulated term with a fixed meaning, which is precisely the problem. It can range from a device that was opened and never used to one substantially rebuilt — and the word alone tells you
Passive blocks sound physically. Active generates sound to cancel it. They work on different frequencies, which is why good headphones use both. Passive noise isolation is just physics and materials
Because each version raised the bandwidth available, and bandwidth determines what combination of resolution, frame rate, colour depth and audio a cable and port can carry. The main versions: HDMI
Optical zoom moves glass. Digital zoom crops the image. Only the first adds detail. Optical zoom physically changes the lens's focal length, or switches to a different lens with a longer one. Light
mAh measures charge. Wh measures energy. Only one of them lets you compare batteries meaningfully, and it is the one manufacturers advertise least. mAh (milliampere-hours) describes how much
Because supporting a device costs money indefinitely while it generates revenue once, and because the support chain involves parties beyond the phone maker. Why support ends: Chipset vendor support.
They are successive generations of the 802.11 standard, and the practical differences are less about peak speed than about how well the network copes with many devices at once. Wi-Fi 5 (802.11ac),
IP stands for Ingress Protection, and the two digits rate protection against solids and liquids separately, under the international standard IEC 60529. The first digit — solids, on a scale of 0 to 6:
Both grant permission connected to entering a country, but they differ in what they are, how they are assessed, and how much they guarantee. A visa is a formal permission issued by a country's
They are two opposing network strategies, and the choice shapes almost everything about how an airline operates and what your journey looks like. Hub-and-spoke concentrates flights through one or a
Mainly the jet stream — a band of very fast, high-altitude wind that aircraft fly with or against depending on direction. What the jet stream is. Narrow currents of air circling the planet at roughly
A tourist tax is a charge levied on visitors, most commonly per person per night on accommodation, though entry fees, departure taxes and cruise levies also exist. Why cities are adopting them:
Because the requirement is designed around the worst case for the destination country, not around the length of your trip — and misunderstanding this ruins holidays regularly. The logic. If a visitor
Because of manual handling limits for baggage handlers, not aircraft weight — which is the reason it is a per-bag limit rather than a per-passenger total. The health and safety basis. Baggage
The honest answer has shifted over the years, and the rule now rests on less dramatic grounds than it once did. The original concern was electromagnetic interference with aircraft avionics —
Because a predictable percentage of passengers do not turn up, and an empty seat on a departed flight earns nothing and can never be sold again. The economics. Airline seats are a perishable
The headline fare buys a seat and very little else. The unbundling of everything previously included is the entire business model, not a series of petty charges. Typically excluded and charged for:
In the UK and EU, air passenger rights are set by regulation rather than by airline goodwill, and they are considerably stronger than most travellers realise. Which rules apply. UK261 and EU261 cover
Mitigation reduces the cause. Adaptation reduces the harm. Both are necessary, and treating them as alternatives is a mistake that has cost real time. Mitigation means limiting climate change itself
Microplastics are plastic fragments smaller than 5mm. Nanoplastics are smaller than 1 micrometre and are of increasing concern because they can cross biological barriers. Two origins: Primary
The circular economy is an economic model designed to keep materials in use rather than discarding them — replacing the linear pattern of take, make, dispose with systems where products and materials
It cannot create energy — it moves it. A heat pump does not generate heat from electricity the way a heater does; it uses electricity to transfer heat that already exists from outside to inside. That
Embodied carbon is all the greenhouse gas emitted in creating and eventually disposing of something — extracting raw materials, manufacturing, transport, construction, maintenance and demolition. It
Because it scores extremely well on the metric that matters most for climate and poorly on several others, and people weight those differently. The case for it: Very low lifecycle emissions,
Renewable describes where the energy comes from — a source that replenishes naturally. Low-carbon describes what it emits. The two overlap heavily but are not the same, and conflating them causes
Because making cement, the binding ingredient in concrete, releases carbon dioxide through chemistry as well as through fuel — and there is no easy way around the chemistry. Cement production
Net zero means the total greenhouse gases added to the atmosphere are balanced by an equivalent amount removed, so the net addition is zero. It is deliberately different from absolute zero, which
A carbon offset is a credit representing one tonne of CO₂ either removed from the atmosphere or prevented from being emitted somewhere else, bought to compensate for emissions you produced. The types
A performance improvement plan (PIP) is a formal, documented process setting out where an employee's performance falls short, what improvement is required, over what period, and with what support.
An exit interview is a conversation, usually with HR, when you leave a job — covering why you are going, your experience, and what could improve. What the employer wants from it: patterns across
Imposter syndrome describes persistently doubting your own competence and attributing success to luck, timing or having fooled people, alongside a fear of being exposed as a fraud — despite evidence
Because withholding it has historically favoured the employer in negotiation, and until recently almost nothing compelled them to publish it. The reasons employers give: Flexibility. They want to pay
Usually not, though the standard advice against it is repeated more confidently than the evidence supports. A counteroffer is your current employer's attempt to retain you after you resign, typically
Because job adverts are usually written as a wish list, not a specification — and understanding that changes how you should respond to them. Why they end up that way: They are assembled, not
Redundancy is a dismissal for a specific reason: the job is no longer needed. Dismissal generally refers to termination for a reason relating to you — conduct, capability, or another substantial
Both are mechanisms employers use to limit what you do after you resign, and they work very differently. Garden leave keeps you employed but away from the workplace during your notice period. You
In UK law these are three distinct employment statuses with sharply different rights, and what your contract calls you does not decide it — a tribunal looks at the reality of the arrangement.
A probation period is a contractual arrangement at the start of a job, during which both sides assess whether it works. It is a contractual concept, not a legal status — which is the point most
Metacognition is thinking about your own thinking — specifically, knowing what you know, monitoring how well learning is going, and adjusting your approach accordingly. It is consistently among the
Because the boundaries are the mechanism that keeps the standard constant when the paper is not. The underlying problem. It is impossible to write two exams of exactly equal difficulty. Question
Because different disciplines need different information foregrounded, and each developed conventions that suit how it actually reads and uses sources. The main families: Author-date systems
Plagiarism is presenting someone else's work, ideas or words as your own. The definition is broader than most students assume, and intention is often not the deciding factor. What counts: Copying
They are three levels of higher education qualification, distinguished by depth, duration and — most importantly — by what you are expected to do with knowledge rather than how much of it you have.
The Feynman technique is a study method built on one principle: explaining something simply is the test of whether you understand it. It is named after physicist Richard Feynman, who was known for
Grading on a curve means assigning grades according to a distribution of the cohort's performance, rather than against fixed criteria. It converts an absolute measure into a relative one. The strict