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Plain-English explainers on technology, finance, science, and the hidden systems running everyday life. No jargon, no fluff.
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How Self-Driving Cars Work
A self-driving car processes more data every second than a human brain handles in a day. And it still struggles with a plastic bag.
How Traffic Jams Form
Traffic jams can appear on completely clear highways with no accident, no road work, and no obvious cause, just too many cars reacting to each other, and a phenomenon that travels backward down the road like a wave.
Latest explainers
How Sovereign Wealth Funds Work
Sovereign wealth funds invest national savings, often from oil, gas, or trade surpluses, into global stocks, bonds, and infrastructure. They are designed to protect future generations and smooth economic shocks.
How The Postal System Works
The postal system moves billions of letters and packages across borders every year. It uses sorting centers, tray codes, and a network of post offices to route mail efficiently. Here is how it actually works.
How Credit Card Processing Works
Credit card processing moves money from your account to a merchant in seconds, even though you typically see the charge days later. The system involves your bank, the merchant's bank, and a payment network (Visa, Mastercard, Amex) that acts as a translator and guarantor between them. When you tap or swipe, the transaction is authorized, cleared, and settled through a process that takes 1-2 business days to appear on your statement.
How Fiber Optic Cables Work
A fiber optic cable transmits data as pulses of light through a thin glass or plastic fiber. The light is trapped inside by total internal reflection, a phenomenon that occurs when light hits the boundary between two materials at just the right angle. Invented and developed by Charles Kao in the 1960s, fiber optic cables now carry nearly all the world's internet traffic and are vastly superior to copper wire for long-distance communication.
How Google Docs Works
Google Docs feels instant even when many people type at once. Here is the system design behind that illusion.
How Venture Capital Term Sheets Work
A venture capital term sheet is the negotiation blueprint for an investment round. It sets valuation, investor rights, founder control, and what happens in a sale or down round before lawyers draft the long legal documents.