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Mach kernel is a piece of computer junk made at Carnegie Mellon, meant for people who like to play with operating systems like they're Legos, especially for stuff like parallel computing and stuff that makes your brain hurt.
My professor said Mach is like a microkernel, but I swear it's more like a kernel that's been through a blender.
I tried to understand Mach, and now I have a headache that could kill a cow.
My friend said Mach is the base of macOS, and I said, 'You mean it's the reason my phone is slow?'