system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How does a single degree(C°) make such a large difference when it comes to fevers?
gpt
Lots of natural processes are substantially affected by small differences in temperature. Water won't freeze at 1C, but will freeze at 0C, for example. 

It might seem odd that small changes can make such a big difference, since a difference of one degree in the air temperature doesn't usually feel like a huge difference. But, consider that part of the reason one degree doesn't usually feel like a lot is because your body has a ton of mechanisms that are working 24/7 to keep your core body temperature where it needs to be, compensating for whatever temperature swings are happening around you. If you didn't have your body's internal heating and cooling systems, trust me, one degree Celsius would feel like a huge difference.. Life and death, even.