Bluetooth connects headphones, wearables, keyboards and smart devices without cables. Learn how pairing, radio hopping, Low Energy and security work.
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Wi-Fi connects phones, computers and smart devices without a network cable. Learn how radio signals, routers, frequency bands and security work together.
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Satellites may seem like the obvious way to connect continents, but most international internet data travels through fiber-optic cables on the seafloor. Here is how those cables are built, laid, powered, protected and repaired.
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Learn how image resolution, pixel dimensions, PPI and DPI affect screens, printing and file size—and how to resize images without common mistakes.
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