I started biting my cheeks on purpose while reading this thread, but in a delicate, sexy way

I'm reading a book that is talking about astronauts and (among other things) motion/space sickness. Apparently the leading conjecture is that because the part of the brain that handles removing poisons from our stomachs (i.e. the "emetic brain") is close to the part of the brain that handles balance and orientation, they evolved some crosstalk so that inbalance gets registered as a poison that needs to be removed. For no other reason at all.

An Intelligent designer would not have made such a pithy mistake!