Originally Posted by Antares Navaar
Midi-Chlorians. Why? The force was some mystical, inexplicable thing until this came along.
No, it still is mystical. Midi-chlorians are not the Force and were never meant to be. Midi-chlorians do explain Luke's line in RotJ: "The Force is strong in my family. I have it, my father has it, and my sister has it too." Midi-chlorians explain why some being are more connected to the Force (and can therefore use it) than others.