Technology
How Does Wireless Charging Work?
Wireless charging uses electromagnetic induction: a coil in the charger creates a changing magnetic field, which induces current in a matching coil inside the device.
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Space
How Do Astronauts Sleep in Space?
Astronauts sleep in small pods or tethered sleeping bags, using scheduled lighting, eye masks, ventilation, and routine to compensate for microgravity, noise, and 16 sunrises per day.
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Technology
How Do Barcodes Work?
Barcodes encode numbers as patterns of black bars and white spaces. A scanner reads reflected light, converts the pattern into digits, validates it with a check digit, and looks up the product in a database.
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