It is flu season. You must be careful. It is very easy to catch the flu. You should wash your hands often. You should get a flu shot. A flu shot will help protect you. But there is a problem with a flu shot. The problem is the needle. The nurse will stick a needle in your arm. Your arm will be sore for a day. Maybe two days. Nobody likes to have a sore arm. But which is worse - a sore arm, or a sore body? A sore body is worse than a sore arm. Do you want your arm to hurt, or do you want your whole body to hurt? Your body will hurt for a week. Maybe it will hurt for two weeks.