In December 2014, Google introduced a reCAPTCHA checkbox that let many users skip distorted letters while the system weighed browser characteristics and a Google tracking cookie before deciding whether to show another challengeSeptember 9, 2026
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When a lightning return stroke heats a channel only centimetres wide to roughly 30,000 kelvin, about five times the temperature of the Sun’s visible surface, the air expands so violently that the pressure wave rolls across the ground as thunderJuly 28, 2026
