Pittsburgh - the most surprisingly wonderful city in America.

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