It was a Radio Lab (Fungus Amungus): https://www.wnycstudios.org/podcasts/radiolab/articles/fungus-amungus https://www.wnycstudios.org/podcasts/radiolab/article

It was a Radio Lab (Fungus Amungus): https://www.wnycstudios.org/podcasts/radiolab/articles/fungus-amungus https://www.wnycstudios.org/podcasts/radiolab/articles/fungu... The theory is that in wealthy countries with good public health, there's less need to maintain a high body temperature to fend off threats. The show said that human body temperature "has been steadily declining for decades at a rate of, like, .05 degrees Fahrenheit per decade." (though not in less developed countries)...average is said to be more like 97.5 degrees.