Science courses are taught in metric.
I can rattle off numerous natural measurements (such as the acceleration of Earth's gravity at Sea Level being approximately 9.8 m/s2 or the speed of light).... but if you asked me how to do any sort of science in American Standard I couldn't do it.
The ONLY thing I know is that light moves 186,000 miles per second.
I couldn't name anything else... in large part because as far as I'm aware, there's no American Standard unit of mass... only force.