system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why our body temperature is 98.6 degrees but 98 degree weather is too hot for us.
gpt
Our optimal temperature is 98.6 degrees, but metabolism produces heat.  When the flow of heat away from the body isn't sufficient to keep the temperature at 98.6, you begin to sweat and feel uncomfortable.  At 98.6 degrees of air temperature, there will be no heat flow away from the body unless you begin to sweat.