Pain and Fear

Question: I am pain, I am fear, I will take what you hold dear, Nations shudder when I'm near, Many die when I'm here. What am I?

Question: What cannot be seen or felt, but can only be broken by voice?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What asks but never answers?

Question: There is an ancient invention still used in some parts of the world today that allows people to see through walls.What is it?