Why Do We Catch A Cold?

Sneezing, scratchy throat, runny nose -- everyone knows the first miserable signs of a common cold. But what is a common cold really? What causes you to .\r
\r
Whether you caught the common cold or came down with something much worse, have you ever wondered what is actually going on inside your body?\r
\r
A weekly show where we endeavor to answer one of your big questions. This week, Jacob White asks, Why does my nose get runny when Im cold? -- Mental .\r
\r
When you get the flu, viruses turn your cells into tiny factories that help spread the disease. In this animation, NPRs Robert Krulwich and medical animator David .