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School is back in session, so it is time for a little pop quiz. What is an item that almost every student carries? If you said backpack, you are off to a great start. Do you know what it takes to be at the head of the class? Let’s find out if you are a star student or need to brush up a little on your backpack knowledge. Most students carry a backpack filled with their books at some point during their school day. Did you know a heavy backpack can cause neck, shoulder, or back pain. Those narrow straps can also compress on nerves in the shoulder, leading to arm numbness, tingling, or weakness. Overweight backpacks can also change the center of balance making it easier to trip. Here is the first quiz question. A student’s backpack should not weigh more than what percentage of the student’s weight? A) 50%, B) 25%, or C) 15%? Answer: (C) The American Academy of Pediatrics recommends that a backpack weigh no more than 15% of a child’s weight. For example, a 60 pound child’s backpack should weigh no more than 9 pounds.