It starts with the main charecter scout finch, his father is atticus finch and his father was also a attorney whos trying/tried to prove innocence to this one black man who has accusations of rape. That's basically a summary your welcome.
Meaning if you have the same enemy, you guys are friends (common enemy)
I believe the centrifuge "flings" things in both directions, because the process of a centrifuge is to separate fluids.