A child's question: What is the relation of Coldness and Catching cold?

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Hi friends! Usually we think children are more curious. They ask many things that are very normal for us. Actually we also don't know the answer, but it became usual for us. I remember I had also my own questions some day in my childhood. The questions I never found a good answer for them till it became usual for me. Maybe some day in future my child will ask me one of them. I want to ask you one of those which raised for me when I was around 10. We know that cold is an illness caused by viruses. So why we are careful on the temperature and coldness not to catch a cold? Why when its cold we get sick or is it just a wrong believe?