There is a man who comes to my house almost every day. No matter what the weather is like, this special helper still comes by. When the rain is pouring down, he stops by. When it is really cold, he stops by. When it is blazing hot, he still stops by. Whenever he stops by my house, he always leaves something for my family. Typically, he leaves something for my parents. Every once in a while, though, he drops off something special for me. Those days are my favorite. Do you know who my visitor is? I bet you do because I know that this person visits your house, too. I am talking about the mail carrier. Mail carriers are a part of the U.S. Postal Service. This is a federal agency. They deliver mail to every home and .....