Answers common questions about the nervous system.

What are nerves? -- Why can't I see in the dark? -- How does my eye work? -- Why do loud noises hurt my ears? -- Why does spinning make me dizzy? -- Why can't I smell when I have a cold? -- Why do some things taste nasty? -- Why do I feel pain? -- Why do I get a toothache? -- What is a reflex? -- What does my brain do?.