There is an ancient invention riddle

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?

Question: Where do all the letters sleep?

Question: What tastes better than it smells?

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

Question: What loses its head in the morning and gets it back at night?

Question: What two things can you never eat for breakfast?