Spain suffers a heat wave with temperatures around 40 degrees. To beat the summer heat, people on 6 August 2018, in Madrid, Spain, go to "Madrid Río", a green oasis park in city's concrete jungle. (Photo by Alvaro Hurtado/NurPhoto via Getty Images)

If you imagined that the summer of 2018 was killing you, chances are, you weren’t alone. Science indicates that humidity, one of the defining hallmarks of an overbearing summer heat wave, actually does have the potential to kill you. The summer of 2018 was exceptionally deadly, as it was the 4th hottest summer on record.

In August of this year, 17 states in the eastern US were under heat advisory warnings. In addition to the already high temperatures, the combination of heat and humidity easily makes temperatures feel like they are well in the 100s. This is hot enough to be a legitimate health concern for many people.

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