mach kernel
Mach kernel is like a computer's brain that was made at a university, and it's so old it's basically a microkernel, but not all of it is. It's also the reason your computer sometimes looks like it's having a nervous breakdown.
Mach is the reason my computer freezes like it's been in a fight.
My friend said Mach is used in Apple's stuff, and I said, 'So that means my iPad is from hell?'
I tried to run Mach and my computer looked like it had been run over by a bus.