The fact "Somewhere studs can be is in a wall" is illustrated with the story:1. Floor and ceiling beams have the same purpose as wall studs2. Wall studs keep your drywall up3. Nails are used to fasten the drywall to the studs4. Hardware stores sell a product that you can use to find the nails under your wall finish so you know where the studs are5. If you want to fasten a heavy object to your wall, like a shelf or a picture frame, you need to fasten it to a wall stud