How Things Work on Instagram: "Moisture evaporates from the eye extremely quickly between blinks because the tear film is only a few micrometers thick and constantly exposed to air. After each blink, a fresh tear layer spreads across the cornea, but evaporation begins almost immediately, driven by airflow, temperature, and humidity. In dry or windy conditions, significant tear thinning can occur in under one second, which is why blink rate increases subconsciously. Blinking restores moisture, re

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Our Planet on Instagram: "Incidents like this highlight how complex and powerful everyday infrastructure can be. Escalators are designed with multiple safety systems, including speed governors, brakes, and sensors that normally prevent sudden acceleration or reversal. In rare cases, mechanical failure, improper maintenance, or damage to critical components can cause an escalator to behave unpredictably. When that happens, passengers can lose balance within seconds, turning a routine commute into