According to the Wall Street Journal, 98.6 degrees is no longer the normal body temperature.
150 years ago is when 98.6 degrees was established as a "normal body temperature." A German physician tested a million temperatures from 25,000 patients and came up with 98.6 as an average.
However, new studies and researchers from Stanford University argue that 98.6 degrees is too high. They claim that number was right back then, but human bodies have changed.
Those Stanford researchers say that today, the normal human body temperature is 97.5 degrees.
This number can vary slightly based on where you're taking the temperature from. For example, temperatures taken from the ear tend to be half a degree higher than when taken from the mouth.