When I was a kid and needed a day off from school I had this little trick. I would complain that I was Ill, my mom would stick a thermometer in my mouth and leave the room. During the intervening five minutes before my mom would come back and check the thermometer, I would rush over to the desk lamp and use it to heat up my temperature to a fever level. A new study claims that the National Climate Data Center is doing the same thing to make it look like the American temperatures are wamer than they actually...