One of the biggest problems that humanity has faced for thousands of years is heat. 

Excessive heat made it difficult to work in the middle of the day. Heat was especially problematic in the tropics, where a shockingly large percentage of humanity lived. 

As cities became more developed, excess heat, all year round, became a limiting factor in how tall buildings could get. 

All of this was solved with one invention.

Learn more about air conditioning and how it helped usher in the modern world on this episode of Everything Everywhere Daily.

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