Lately it can feel like we've somehow accidentally opened a portal to the heart of the sun.

Pictured: Phoenix, Arizona. Image from NASA Goddard Space Flight Center/Wikimedia Commons.

Unfortunately, heat waves are getting stronger and more common today, thanks to climate change. According to this article by The Guardian, a third of the world is at risk of dangerous heat waves today. While heat waves are hitting us more frequently now than in the past, 100 years ago people still had to deal with the occasional temperature spike. How did they do it?

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