Digital Systems
How QR Codes Work: Squares, Data, and Error Correction
A QR code stores bits in a two-dimensional grid of dark and light modules.
Everyday Science
Why Is the Sky Blue? Rayleigh Scattering Explained
The daytime sky looks blue mainly because air molecules Rayleigh-scatter shorter visible wavelengths more strongly than longer ones.
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Everyday Science
Why Do Cats Purr? What Science Knows and Doesn't
Cats purr by generating low-frequency vibration in the larynx during both inhalation and exhalation, but the exact control mechanism remains under study.
Maps & Time
Why Time Zones Zigzag Instead of Following Longitude
Time zones zigzag because civil time is a political and social agreement, not a direct longitude readout.