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In hot, dry climates, traditional buildings sometimes use shaded courtyards, fountains and pools to reduce heat. Evaporating water absorbs energy from the surrounding air, while carefully designed openings help move cooler air through living spaces. The effectiveness depends on humidity and airflow, but the principle can reduce reliance on mechanical cooling.

In 1783, hundreds of unpaid soldiers surrounded Congress in Philadelphia. Pennsylvania refused to call out its militia, so Congress fled the city. The humiliation helped convince national leaders that the federal government needed a capital it could protect without relying on any state.