STEM与日常科技·英语30篇（6）
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How QR Codes Turn Everyday Objects into Information Hubs
二维码如何让日常物品变身信息枢纽
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A QR code is a two-dimensional barcode that stores text, URLs, or contact details in black-and-white squares.
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Unlike traditional barcodes, it can hold over 4,000 characters and be scanned from any angle.
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When you point your phone camera at one, the device decodes the pattern using image recognition software.
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Many museums now embed QR codes beside exhibits to link visitors to audio tours or historical videos.
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Restaurants use them on table tents so diners can view menus, place orders, and pay digitally.
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Farmers print QR codes on fruit labels to show harvest date, origin farm, and pesticide test results.
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These codes don’t require internet to store data—but linking to live content does need connectivity.
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Security-conscious designers add digital signatures to prevent tampering with the encoded URL.
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New versions like QR-Max support offline content delivery using Bluetooth LE fallbacks.
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In essence, QR codes bridge physical objects and digital knowledge—no app download required.