hey guys i could use some help. i know i seem to ask this lots .... hrm wonder why

. any ways i have a major philosphy paper due say by tomorrow and i am stuck. i need to answer the question can skepticism ever be defeated? i dont think it can in this case [ a brain in a vat story.( the story pretty much goes "if a scientist drugged you and stole your brain and put it into a super computer and a computer controls your reality)]. my brain is racked and i need like 500 words on why it cant be or can be defeated. any one have any suggestions