Riddle #456

Question: I am a big threat to humanity,
but you wouldn't get rid of me even if you could.

What am I?

Question: What is that thing we buy for eating but cannot eat it?

Question: Look at my face, I am somebody. look at my back, i am nobody. What am I?

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?

Question: What tastes better than it smells?

Question: You build a house and all 4 walls are facing south. Where did you build the house?