Why Does Time Feel Faster as We Age?
Time perception is not a clock. It depends on how much new information your brain encodes, and a week with few novel events leaves a very thin record to look back on.
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How Does a Plane Stay Up?
A wing generates lift by pushing air downwards. The popular explanation involving air travelling further over the top is wrong, and the correct one is simpler than it sounds.
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What Causes Recessions?
A recession is a self-reinforcing drop in spending. One sector cuts back, incomes fall, spending falls further, and the loop continues until something interrupts it.
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Why the Industrial Revolution Started in Britain
Machines were not the cause. Britain had expensive labour and very cheap coal, which made replacing people with powered machinery pay in a way it did not elsewhere.
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How Recommendation Systems Decide What You See
Recommenders mostly do not analyse the item. They find people who liked what you liked, then show you what those people liked next, and that produces both the accuracy and the tunnel vision.
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Why Do Onions Make You Cry?
Cutting an onion ruptures cells, which lets enzymes produce a volatile sulfur compound. It reaches your eyes, reacts with the water there, and triggers tears.
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What Is Sleep For?
Sleep is not simply rest. The brain does specific work during it, consolidating memory and clearing metabolic waste, and the timing is controlled by two separate systems.
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How Habits Actually Form
Habits form through repetition in a stable context, not through motivation. The timeline is longer than the twenty-one days everyone quotes, and missing a day costs almost nothing.
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How the Black Death Changed Europe
Killing a large share of the population changed the value of labour. In parts of Europe wages rose, serfdom weakened, and a society built on cheap labour had to reorganise.
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How Encryption Protects Your Data
Encryption turns data into something unreadable without a key. Modern systems use two different kinds at once, because each solves a problem the other cannot.