Answer:
I am black within and red without; with four corners round about. What am I?
Take off my skin I won't cry but you will.
I contain six letters minus one and you got twelve.
You use a knife to slice my head and weep beside me when I am dead.
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
What made Cyclops quit teaching?